Armando Diego Bedoya, MD
- Medical Instructor in the Department of Medicine
The tumor is centered at the pyloric zone just near the pyloric sphincter prostate infection treatment discount penegra 50 mg online, on the lesser curvature mens health omelette cheap penegra 50mg without prescription. Which of the following signs and symptoms is most likely to be seen in this patient due to the mass effect of the tumor? A 35-year-old woman is brought to the emergency department because of diffuse muscle contractions prostate 049 purchase penegra in united states online. Her husband reports that last week she accidentally stuck her finger with a rusty nail prostate position cheap penegra 50 mg. By which of the following mechanisms does this organism cause the symptoms associated with this disease? A 62-year-old man comes to the physician complaining of a skin rash that is extremely painful mens health 3 day workout order penegra online pills. Laboratory studies show elevated levels of testosterone prostate problems treatment discount 100 mg penegra visa, estrogen, and luteinizing hormone. A newborn initially is healthy but begins to have bilious emesis and fails to pass meconium during the first 48 hours of life. An emergent abdominal barium study is performed during this time and results are shown in the image. A 32-year-old woman with schizophrenia presents to the physician with amenorrhea and a milky discharge from both nipples. Laboratory results show an increased serum prolactin level, a decreased serum gonadotropin level, and a normal thyroid stimulating hormone level. An 18-year-old woman is brought to the pediatrician by her mother because of changes in her behavior. The patient says she feels fine and just wants to be left alone, but the physician notes her speech is rather vague and shows little affect. She continues to perform well in school and has few friends, but is otherwise healthy. A previously healthy 5-year-old boy is brought to the pediatrician with a three-day history of sore throat, conjunctivitis, rhinitis, and cough. His mother explains that more than 10 children in his class at school have similar symptoms, particularly conjunctivitis. A 40-year-old woman presents with progressive fatigue and bilateral joint inflammation characterized by pain, swelling, warmth, and morning stiffness. The patient says that the symptoms began in her hands over one year ago but have now begun to affect her knees. A 28-year-old man presents to the primary care clinic because his thinking has been "slow" recently, citing for example that he has had trouble remembering the names of his friends. The patient also mentions that he has been feeling depressed, and that he has recently lost a significant amount of weight. Physical examination is notable for purplish skin lesions distributed across his torso. Blood was drawn from the four men suspected to be the father (F1, F2, F3, F4) as well as from the mother (M) and the infant (C). The resulting fragments were separated with gel electrophoresis and a Southern blot analysis was performed. According to the Southern blot shown in the image, who is most likely the father of the child? On further questioning, she also complains of vaginal dryness and occasional hot flashes. A young couple presents to a fertility clinic, reporting that they have been attempting to conceive a child for 16 months without any success. The 25-year-old wife has undergone hormonal analysis, and it has been determined that she menstruates normally and her follicles are viable. Karyotype analysis is performed, and reveals the presence of an extra sex chromosome. A 2-week-old premature male infant is examined in the neonatal intensive care unit, and shows a wide pulse pressure and a holosystolic and holodiastolic murmur. On echocardiography he has blood flow between the left pulmonary artery and the aorta. Which of the following symptoms would the mother have experienced during pregnancy to increase the risk of having a child with this disorder? After injection of the anesthetic agent, the woman complains of palpitations and severe dizziness. Upon investigation it is discovered that the resident did not ensure that the epidural needle did not pierce a vessel. Which of the following anesthetic agents was most likely administered for the procedure? Comparing the oxygen-hemoglobin dissociation curves in the image, which of the following conditions represents curve B as compared to curve A? Her physician would like to begin an antihypertensive agent but the patient refuses, fully understanding the risks, benefits, and outcomes that would result with or without treatment. A 19-year-old woman with no significant past medical history presents to her primary care physician for a sports physical. Her examination is notable for a brachial artery pressure of 160/110 mm Hg and a weak femoral pulse. Prompted by the weak pulse, her physician measures her blood pressure in the lower extremity and finds it to be 80/40 mm Hg. This woman is presenting with a congenital condition that places her at high risk for bacterial endocarditis and which of the following other conditions? A 21-year-old man presents to a new primary care physician for routine physical examination. He demonstrates hyperextensible skin and reports a history of finger and shoulder dislocations, which he has reduced himself. Her physician notes Test Block 5 · Questions 643 (F) Fibrillin (G) Sphingomyelinase 39. A 56-year-old man who is undergoing chemotherapy for colorectal carcinoma develops profound nausea and vomiting four hours after receiving treatments. A 15-month-old boy is brought to the pediatrician by his parents because they have noticed that he has difficulty walking. He has no personal or family history of medical illnesses and denies trauma prior to the onset of his pain. On examination, he is tachypneic and has decreased breath sounds at the right upper zone of the lung. A 7-year-old girl with no significant medical history presents with a five-month history of persistent weakness despite taking vitamins and supplements. Physical examination is completely benign, with normal blood pressure and no peripheral edema. Laboratory studies show hyponatremia, hypokalemia, metabolic alkalosis, and an increased plasma renin level. A 47-year-old man presents with diarrhea, abdominal pain, loss of appetite, weight loss, and fatigue. Her physical examination is significant for an inability to fully cover her eyes with her eyelids and swelling on the anterior surface of both legs. The skin of her anterior legs appears dry and waxy and has several diffuse, slightly pigmented papules. The drug of choice for this disorder acts at what step in thyroid hormone synthesis? A 61-year-old alcoholic presents to the emergency department with disorientation, confusion, and an unsteady gait. Horizontal nystagmus, pulmonary rвles, and edematous lower extremities are noted on physical examination. On questioning, the patient states that he started drinking alcohol when he was a prisoner of war in Vietnam. His current alcohol level is within the legal limit, a toxicology screen is negative, and a stroke has been ruled out by imaging. Which of the following additional tests should be performed to estimate the extent of his disease? A 42-year-old man comes to the physician complaining of abdominal pain for the past three months. A patient with long-standing renal failure secondary to focal segmental glomerulosclerosis undergoes parathyroid biopsy that shows marked hyperplasia. Which of the following sets of laboratory values is most likely to be seen in this patient? Medullary carcinoma of the thyroid is a calcitonin-secreting tumor of parafollicular thyroid cells ("C cells"). Microscopically, the tumor consists of nests of tumor cells in an amyloid-filled stroma. Atrophic follicles with prominent germinal center formation and lymphocyte infiltrate are characteristic of Hashimoto thyroiditis. A papillary branching pattern of epithelial cells with ground-glass nuclei and psammoma bodies (laminated concentric calcified spherules) is seen in papillary carcinoma of the thyroid, the most common form of thyroid cancer and also the form with the best prognosis. Sheets of undifferentiated pleomorphic cells are seen in anaplastic, or undifferentiated, thyroid cancer. This form of thyroid cancer is more common in older patients and has a very poor prognosis. It is composed of relatively uniform follicles lined with cells that are typically larger than those seen in a normal thyroid. The appointed durable power of attorney is truly durable and therefore supersedes even a living will. The patient, in good state of mind, believed that the friend would make decisions with which he would agree. The durable power of attorney should always make decisions consistent with what he believes the patient would want. Many states acknowledge next of kin as durable power of attorney, unless it has been otherwise specifically assigned, as in this case. The durable power of attorney is the ultimate decision maker and their decision to withdraw life support will be upheld despite the existence of a living will. Input from family members is both important and appropriate, but is not legally necessary. Hairy cell leukemia is caused by malignant B lymphocytes that commonly show varying numbers of projections from cytoplasm, giving the cell a "hairy" or "ruffled" appearance as seen in the image above. It is four times more prevalent in men than in women, and patients usually complain of abdominal fullness, fatigue, and weight loss test Block 5 Full-length exams Test Block 5 · Answers 647 but rarely of night sweats or fevers. Elevation of tartrate-resistant acid phosphatase in the B lymphocytes from bone marrow confirms the diagnosis of hairy cell leukemia. Chronic lymphocytic leukemia is also a B lymphocyte-derived neoplasm whose presentation is very similar to that of hairy cell leukemia. Its B lymphocytes, however, would not typically demonstrate an elevation in tartrate-resistant acid phosphatase. Follicular lymphomas are the most common type of indolent nonHodgkin lymphomas and are characterized by an increase in number of normal-appearing germinal centers, which are not described here. Mantle cell lymphoma is a B lymphocyte subtype of non-Hodgkin lymphoma that is characterized by small cells with cleaved nuclei resembling the cells in germinal centers. Although its clinical presentation can be similar to that of hairy cell leukemia, it lacks the "hairy" appearance histologically and does not show any increase in tartrate-resistant acid phosphatase. All Hodgkin lymphoma variants are differentiated by the presence of Reed-Sternberg cells and commonly present clinically with night sweats, fevers, and weight loss. The nodular sclerosis variant is distinguished by a nodular pattern separated by areas of collagen banding and the presence of lacunar cells. Myositis and rhabdomyolysis are potential complications of co-treatment with a statin drug and a fibric acid derivative. Although this combination is not explicitly contraindicated, the two drugs should be used together with caution. The adverse effects of ezetimibe include diarrhea, abdominal discomfort, and arthralgias. The combination of fibrates with statin medications has an additive effect that might more frequently result in myositis. Simvastatin and ezetimibe combined can cause elevation in liver transaminases, so patients taking these drugs together should have periodic liver function tests. The second arch also gives rise to the posterior belly of the digastric, the stylohyoid, and the stapedius muscles. The first branchial arch develops into the muscles of mastication, the mylohyoid, the anterior belly of the digastric, the tensor veli palatini, and the tensor tympani. These muscles are innervated by cranial nerve V and are not affected by Bell palsy. The third branchial pouch develops into the inferior parathyroid glands and the thymus. The thyroglossal duct connects the thyroid diverticulum to the foregut in the embryo but is obliterated during development. This patient has a macrocytic anemia with hypersegmented neutrophils, a condition most likely caused by either vitamin B12 deficiency or folate deficiency. Increased homocysteine levels are indicative of folate deficiency or vitamin B12 deficiency, but are not helpful in distinguishing between the two. Any patient with a macrocytic anemia and hypersegmented neutrophils could have a folate deficiency. However, this is highly unlikely in this patient who ingests a diet high in leafy green vegetables. Two causes of these findings on blood smear are vitamin B12 deficiency and folate deficiency. A primary dietary deficiency can often be seen in people who maintain a strict vegan diet for many years with no vitamin supplements, since vitamin B12 is primarily obtained from animal products.
However prostate cancer psa 0 penegra 50mg low price, outcomes have been mixed prostate cancer biopsy procedure order penegra 50 mg, with postoperative cerebrospinal fluid otorrhea and decreased hearing (30%) reported as known complications man health customer main customer public discount 50 mg penegra fast delivery. Although aplasia of the stapes is rare mens health 9 cheap 100 mg penegra free shipping, multiple forms of hypoplasia that include small or absent crura and small prostate supplements generic penegra 100 mg overnight delivery, blob-like stapes have been described prostate 1 a vogel reviews buy penegra 100 mg low price. The surgical options include total stapedectomy in cases with a fixed footplate, or replacement with a stapes prosthesis in cases of a mobile footplate. In contrast, isolated hyperplasia of the stapes is often an incidental finding that does not require therapy. Location Malleus Anomaly Hypoplasia or aplasia Head fixation Manubrium fixation Manubrium aplasia Manubrium separation from head Spindle handle Hypoplasia or aplasia Long process hypoplasia Lenticular process hypoplasia Fixation Hypoplasia or aplasia Aplasia of the head or crus Hyperplasia Columellar stapes Superstructure fixation Head fixation Obturator foramen obliteration Stapedius tendon ossification Footplate fixation, absence, or doubling Juvenile otosclerosis Ossicular agenesis Malleus-incus fusion Incudostapedial joint disarticulation, absence, or fixation Ossicular mass 653 Incus Stapes Figure 484. Failure of the normal association between the primordial oval window niche (the otic capsule) and the developing stapes footplate between the fifth and sixth weeks of development results in aplasia of the oval window and is most commonly associated with anterior displacement of the tympanic segment of the facial nerve. Radiographic imaging may also be used to confirm the presence of normal inner ear structures, determine the anatomy of the facial nerve, and detect any associated ossicular anomalies. Options include hearing aids, vestibulotomy with prosthesis insertion, fenestration and piston insertion above the aberrant facial nerve, or fenestration of the horizontal semicircular canal. Furthermore, the facial nerve and the inner ear are at considerable risk for injury during these surgical approaches. More commonly, the round window position and size may vary without functional consequence. During week 11 of fetal development, a condensation of connective tissue forms at the future site of the round window. This develops into a cartilage ring that prevents ossification of the round window niche. Failure of the development of this ring results in bony obliteration of the primordial niche. Round window aplasia is often associated with stapes ankylosis and a 40-dB conductive hearing loss. When stapedectomy is unsuccessful in reversing this hearing loss, the absence of the round window may be diagnosed in retrospect. Attempts at surgical fenestration have met with poor results and carry a significant risk of sensorineural hearing loss. Congenital absence of the oval window: radiologic diagnosis and associated anomalies. Non-syndromic cases of round window anomalies are rare, with fewer than 10 reports described Otitis Media Philip D. There is no absolute time period, but, in general, disease that persists for more than 3 months should be considered as chronic. Otitis media associated with cholesteatoma is considered separately in Chapter 50, Cholesteatoma. The normal physiologic functions of the eustachian tube are to (1) maintain the gaseous pressure within the middle ear cleft at a level that approximates atmospheric pressure; (2) prevent reflux of the contents of the nasopharynx into the middle ear; and (3) clear secretions from the middle ear by both mucociliary transport and a "pump action" of the eustachian tube. Both anatomic and functional obstruction of the eustachian tube results in the failure of normal regulation of the middle ear pressure. Anatomic obstruction is most commonly caused by inflammation of the eustachian tube mucosa or extrinsic compression by tumor or large adenoids. Functional obstruction usually occurs as a result of either the failure of the normal muscular mechanism of eustachian tube opening, as seen in cleft palate, or insufficient stiffness of the cartilaginous portion of the eustachian tube, often seen in infants and young children. The more acute angle of the eustachian tube seen in children, compared with adults, may also result in the impaired function of the eustachian tube opening. If the eustachian tube is abnormally patent or short, its normal protective function against the reflux of nasopharyngeal contents is lost. The protective mechanism of breast-feeding has not been clearly demonstrated, but is likely to be related to antibacterial and immunologic benefits conferred by breast milk. Passive smoking results in inflammation of the mucosa of the middle ear cleft as well as impaired mucociliary clearance, which lead to an increased susceptibility to infection. These genetic variations may be related to anatomic and physiologic variations in the eustachian tube. Because the tensor veli palatini muscle lacks its normal insertion into the soft palate, it is unable to open the eustachian tube properly on swallowing. Inflammation of the middle ear mucosa results in an effusion, which cannot be cleared via the obstructed eustachian tube. This effusion provides a favorable medium for proliferation of bacterial pathogens, which reach the middle ear via the eustachian tube, resulting in suppuration. Less frequently identified pathogens include group A streptococci, Staphylococcus aureus, and gram-negative organisms such as Pseudomonas aeruginosa. This finding may occur for a variety of reasons, including (1) antibiotic therapy before tympanocentesis; (2) nonbacterial pathogens (eg, viruses, chlamydia, and mycoplasma); and (3) pathogens that do not proliferate in classic culture conditions (eg, mycobacteria and anaerobic bacteria). Adenoidectomy also has a demonstrable effect, though more modest than that seen with tympanostomy tubes. Otitis externa also presents with otalgia and otorrhea and may be the primary diagnosis, or it may be secondary to the infected discharge from the middle ear. If otalgia is the primary complaint, then referred pain should be considered, particularly when otoscopy reveals a normal tympanic membrane. The common sites of origin of referred otalgia are the teeth and temporomandibular joints. In adults, malignant neoplasms of the pharynx and larynx may present with otalgia as the only symptom. In neonates and infants with a high fever and systemic upset, the possibility of meningitis should be considered. The use of antibiotics is probably beneficial, but there is a trade-off between benefits and side effects. There is no difference demonstrated in recurrence rates or the development of complications among different antibiotics. Older children usually complain of earache, whereas infants become irritable and pull at the affected ear. A high fever is often present and may be associated with systemic symptoms of infection, such as anorexia, vomiting, and diarrhea. Otoscopy classically shows a thickened hyperemic tympanic membrane, which is immobile on pneumatic otoscopy. Further progression of the infective process may lead to the spontaneous rupture of the tympanic membrane, resulting in otorrhea. At this stage, it is often not possible to visualize the tympanic membrane because of the discharge in the ear canal. If symptoms are severe, a blood count often reveals a leukocytosis, and blood cultures may detect bacteremia during episodes of high fever. A culture of the ear discharge is helpful in guiding antibiotic therapy in patients in whom the first-line treatment is unsuccessful. As a consequence, factors resulting in an overproduction of mucus, an impaired clearance of mucus, or both can result in the formation of a middle ear effusion. Both viral and bacterial infection can lead to the increased production and viscosity of secretions from the middle ear mucosa. Infection also leads to inflammatory edema of the mucosa, which may obstruct the eustachian tube. Temporary paralysis of cilia by bacterial exotoxins further impedes the clearance of an effusion. Experimental studies have confirmed that the failure of eustachian tube opening can result in a middle ear effusion. Because gas is constantly being absorbed into the microcirculation of the middle ear mucosa, a negative pressure develops in the middle ear cleft if the eustachian tube is blocked. This negative pressure results in the transudation of fluid into the middle ear cleft. The fact that a middle ear effusion can develop as a result of barotrauma (eg, scuba diving) supports this theory for the pathogenesis of middle ear effusions. There is an optimum viscosity of mucus at which effective mucociliary transport occurs. If the mucus formed in a middle ear effusion is either too serous or too mucoid, then the cilia will be unable to clear it efficiently. Recently, the concept of biofilms in the pathogenesis of otitis media has been raised, but the evidence is not conclusive. Biofilms are the structured community of bacterial cells adherent to the mucosa and have antibacterial resistance property. Decongestants and antihistamines for acute otitis media in children (Cochrane Review). General Considerations Otitis media with effusion is defined as the persistence of a serous or mucoid middle ear effusion for 3 months or more. Various terms, such as chronic secretory otitis media, chronic serous otitis media, and "glue ear," have been used to describe the same condition. It is the most common cause of hearing loss in children in the developed world and has peaks in incidence at 2 and 5 years of age. Tympanogram Type A Middle Ear Pressure 99 daPa to +200 daPa Typical Appearance of Trace 659 B No compliance peak C 400 daPa to 100 daPa daPa = deca Pascal. In younger children, the only symptom may be delayed speech development or behavioral problems. Another common symptom is a "blocked" feeling in the ear, which may cause infants and young children to pull at their ears. Otoscopy classically reveals a dull gray- or yellowcolored tympanic membrane that has reduced mobility on pneumatic otoscopy. If the tympanic membrane is translucent, an air-fluid level or small air bubbles within the middle ear effusion may be seen. In adults presenting with a unilateral middle ear effusion, the possibility of a nasopharyngeal carcinoma should be considered. It is easy to use, provides reproducible results, is inexpensive, and is widely tolerated by patients-even young children. By measuring the compliance of the middle ear transformer mechanism, it provides an objective assessment of the status of the middle ear. Tympanometry produces a peak (ie, maximal compliance) when the pressure in the external ear canal equals that of the middle ear. By varying the pressure in the external ear, the tympanometer is able to provide information on the status of the middle ear (Table 493). If there is an effusion in the middle ear, then compliance does not vary with changes in canal pressure, and a flat (Type B) tympanogram is produced. If the air in the middle ear is at or near atmospheric pressure, then a normal (Type A) tympanogram is produced. Negative middle ear pressure results in a Type C tympanogram, with the compliance peak being at less than 99 daPa (deca Pascal). Audiometry provides an assessment of the severity of hearing loss and is Treatment A. A period of watchful waiting of 3 months from the onset (if known) or from the diagnosis (if onset unknown) before considering intervention is therefore advisable. Ideally, early treatment should be initiated in patients in whom spontaneous resolution is unlikely. A multicenter randomized controlled trial identified both the season of attendance (ie, July to December) and a bilateral hearing impairment of > 30 dB as factors that make spontaneous resolution less likely. Autoinflation with purpose-built nasal balloon has been shown to be beneficial, although compliance is generally poor. Medical treatments include antibiotics, steroids, decongestants, and antihistamines. The small chance of benefit from antibiotic therapy needs to be considered along with the fact that a number of patients treated with antibiotics develop significant side effects, such as gastroenteritis and atopic reaction. Myringotomy and aspiration of middle ear effusion without ventilation tube insertion has a short-lived benefit and is not recommended. Insertion of tympanostomy tubes-The aim of tympanostomy tube insertion is to allow ventilation of the middle ear space-hence to improve hearing thresholds. The prolonged ventilation of the middle ear may also allow resolution of chronic inflammation of the middle ear mucosa. Complications include myringosclerosis, purulent otorrhea, and residual perforation after extrusion. There are two main types of tympanostomy tubes: short-term tubes (eg, grommets), which remain in the tympanic membrane for an average of 12 months, and long-term tubes (eg, T-tubes), which can remain for several years. The high incidence of residual perforation following the use of long-term ventilation tubes indicates that they should not be used in uncomplicated cases. The rationale for adenoidectomy is that it relieves nasal obstruction, improves eustachian tube function, and eliminates a potential reservoir of bacteria. General Considerations Chronic suppurative otitis media is defined as a persistent or intermittent infected discharge through a nonintact tympanic membrane (ie, perforation or tympanostomy tube). Chronic suppurative otitis media is particularly prevalent in developing countries and is more common in lower socioeconomic groups in the developed world. Pathogenesis There are a number of mechanisms by which a persistent tympanic membrane perforation may develop. This weakness of the tympanic membrane both predisposes to perforation and reduces the likelihood of spontaneous healing. Although most tympanic membranes heal spontaneously after the extrusion of ventilation tubes, a small percentage do not. There are two main mechanisms by which a chronic perforation can lead to continuous or repeated middle ear infections: (1) Bacteria can contaminate the middle ear cleft directly from the external ear because the protective physical barrier of the tympanic membrane is lost. The loss of this protective mechanism results in the increased exposure of the middle ear to pathogenic bacteria from the nasopharynx. Differential Diagnosis the primary differential diagnosis is the presence of a cholesteatoma. Both pathologies present with a very similar clinical course, and the presence of severe inflammation or granulation tissue can cause difficulty with the diagnosis. Reexamination after a course of medical treatment usually provides an accurate diagnosis.
This is why they did not find more matches between duplicate hairs (38 of the 53 duplicate hairs were found to be unique in that they had no matching hair in the known sample selected) man health workout buy online penegra. Experimental work aimed at determining the optimum composition of a representative known sample is therefore warranted prostate cancer 6 stage buy generic penegra 100mg. Had they been randomly chosen androgen hormone 24 buy 100 mg penegra free shipping, an even smaller number of coincidental matches would have been found man health advice penegra 100mg sale. In a later extension of the study prostate cancer urethra buy 100 mg penegra, Suzanski (1989) compared 25 questioned hair samples of about ten hairs each with known samples from 100 mixed breed and purebred dogs of various types mens health girl next door purchase penegra 50 mg with amex. From these studies of various types of hair, we can conclude the following about the value of macroscopic and microscopic forensic hair comparison evidence. Accordingly, macroscopic and microscopic hair comparison evidence is generally good corroborative evidence. However, practical problems make such an approach both unattainable and undesirable. First, presentation of frequency data on their own can lead to a distorted picture of the value of evidence, along with a false sense of exactness (Gaudette, 1986). It requires examiners to adopt a checklist approach rather than the more natural pattern recognition approach. Two hairs described alike can be markedly different microscopically (Gaudette and Keeping, 1974; Strauss, 1983). Two examiners are likely to describe hairs in slightly different ways (Gaudette and Keeping, 1974; Podolak and Blythe, 1985). The same examiner will even vary his or her description from day to day (Wickenheiser and Hepworth, 1990). Ogle (1991) suggested that such difficulties can be overcome by using hair characteristic reference standards or archetypes. However, as Wickenheiser and Hepworth (1991) pointed out, classification based on archetypes would be limited to one field of view, thus forcing an examiner to decide subjectively which of the hundreds of possible fields of view best represents the hair characteristic. Accordingly, results-oriented research (such as the previously described studies) is much preferable to the database approach. This is not to suggest, however, that information from databases would not be valuable. On the contrary, it could be quite useful in helping examiners to decide which characteristics, and combinations thereof, are unusual and which are common. Secondly, even when the evidential values of the two methods of obtaining a match are determined in similar ways, it has not yet been demonstrated that the two are independent. Accordingly, interpretations of each should be presented separately, with a statement that the results of the two methods substantiate each other, leading to an overall increase of the evidential value by an indeterminate amount. It has brought about an animated and extensive debate over statistical assessment of evidential value. Many of the issues raised in this debate are the same ones previously encountered, in a much lower profile form, in the discussion of probabilities and hair comparison. The following are among the questions being asked (Lempert, 1991; Weir, 1992): `What is the relevant reference population? Indeed, it is doubtful whether there ever will be; many of them depend on subjective personal values (such as degree of conservativeness) and not on objective scientific facts. They cannot do this because as we approach very rare frequencies of events, or very rare alleles and genotypes, the strength of these disciplines wanes and their objectivity, so welldeveloped for populations and multiple events, gives way to subjectivity. The focus changes from general laws acting on populations or multiple events to one on specific events and the question of individual identity. Oklahoma, 1995) even went so far as to deem forensic hair comparison inadmissible according to Daubert criteria. Robertson and Vignaux (1995) provide a good discussion of these criteria and their limitations. It is hoped that the studies mentioned in this chapter will provide ammunition to counter this argument in future cases. Reynolds decision is something of an isolated incident, since the great majority of legal opinion has held forensic hair comparison evidence to be admissible. Nevertheless, it should serve as a wake-up call that the courts will be viewing our field with higher powered microscopes when determining the weight and admissibility of hair comparison evidence. It will be incumbent upon practitioners to provide the research and quality assurance necessary to ensure that forensic hair comparison can successfully withstand this closer inspection. In the past (Gaudette, 1985b), I have recommended the following symmetrical spectrum of conclusions. The great majority of macroscopic and microscopic hair comparisons will result in normal positive or normal negative conclusions, with the other three being rarely encountered. The normal positive and normal negative conclusions cover a wide range of evidential value. Accordingly, it is important that they be further interpreted in reports and court testimony. First, the examiner should mention that hair comparison is not usually a positive means of personal identification. This should be followed by an estimate of the average value of forensic hair comparison evidence. This can be based either on personal experience or on some of the published 255 Forensic Examination of Hair studies described in section 7. The examiner should then discuss factors weakening or strengthening the evidence in the particular case. Some factors which can weaken hair evidence in a particular case are given in Table 7. Some factors which tend to strengthen normal positive hair comparison conclusions are given in Table 7. This approach, which has recently been put into extensive use in Britain, has the advantage of being readily comprehensible to client groups such as police investigators and court officials. It involves assignment of a verbal convention to the degree of support that evidential value (in the form of a likelihood ratio) offers to a particular hypothesis (C). C is formulated to answer directly a question of interest to the police or court. By using the average value of hair evidence coupled with the factors strengthening and weakening the evidence, a forensic scientist can determine which of the four categories (very strong support, strong support, moderate support, or limited support) is appropriate for a particular case. When using this approach, careful wording of hypotheses is extremely important, as is consideration of all the facts and evidence surrounding a case. By taking advantage of collective knowledge and experience, we can calibrate and improve interpretation, report writing, and court testimony. These approaches, which are based on pooling, structuring, and testing knowledge, offer the exciting possibility of being able to apply the best knowledge to all aspects of every case, thereby improving report writing and court testimony concerning forensic hair comparison. As we move towards the twenty-first century, forensic science must transform itself to better meet the needs of our clients. A forensic hair examiner must be concerned with the occurrence of hair as evidence, its recovery, analysis, interpretation, and presentation. Nucleus equieti/o fil/i, fil/o -form -genesis ger/o, geront/o gymn/o -hexia hist/o hydr/o iatr/o -ician ion/o kary/o kel/o -labile later/o -logist -logy -lucent lumin/o ly/o medi/o medic/o mer/o mesomorph/o nom/o nomennos/o nucle/o nutri/o -oma onc/o organ/o path/o pharmac/o physi/o -plasm -poiesis prote/o psamm/o -puncture pyr/o pyret/o sanit/a scirrh/o somat/o -some spectr/o system/o techn/o temp/o, tempor/o the/o -therapy, therapeut/o therm/o -tumescence, tumesc/o -type, typ/o ventr/o -verse vir/o viscer/o vit/o zyg/o 2. To determine the correct definition in a particular medical word, analyze the other terms in the word. Example: Poliomyelitis polio = gray (matter) myel = spinal cord, bone marrow itis = inflammation Definition: Inflammation of the gray matter of the spinal cord. Some terms may function as a root/combining form in one word and a suffix in another word. Autonomic nervous system (involuntary) gray (matter) opening, passageway action, activity mind cold nerve root root split, division sleep tube, fistula identical, same arrangement, coordination end gray (ashen) death sheath vagus nerve poliomyelitis neuropore parapraxia psychokinesis psychrophobia radiculitis rhizotomy schizophasia insomnia syringomyelocele tautomeral dystaxia telodendron tephromyelitis thanatomania neurothecitis vagolysis 2. Pulse Rhythmical expansion and contraction of an artery as a result of the heart contraction F. Two lower (ventricles) vein aging, elderly flow, current, stream -spasm involuntary contraction sphygm/o pulse -sphyxia pulse -stenosis narrowed, constricted tachyfast tel/e end, distant -tension stretched, strained valv/o, valvul/o valve varic/o varicose veins vas/o vessel, vas deferens vascul/o vessel ven/o vein ventricul/o ventricle of the heart or brain venul/o venule 2. 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Vascular abnormality of the conjunctiva pupil retina sclera darkness sound stapes rows mark, point to turn eardrum uvea glassy, vitreous body pimelopterygium pupillatonia retinotoxic sclerectasia scotopia sonometer stapedectomy polystichia astigmatism anatropia tympanosclerosis uveoplasty vitreocapsulitis i. This is a powerful study tool that can be quickly and repeatedly referred to during and well beyond your college years. No part of this publication may be reproduced or transmitted in any form, or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without written permission from the publisher. Candidate should check that correct question paper as per the speciality is received. Choice and sequence for attempting questions will be as per the convenience of the candidate. Candidate should carefully read the instructions printed on the Question Booklet and Answer Sheet and make correct entries on the Answer Sheet. Determine the correct answer from out of the four available options given under each question. Fill the appropriate circle completely like this, for answering the particular question only. Use of whitener or any other material to erase/hide the circle once filled is not permitted. No mark shall be awarded for the particular question if the examinee has marked two or more answers to it or has done overwriting or scratching etc. Rough work should be done only on the blank space provided on the Question Booklet. Immediately after the prescribed examination time is over, the Answer Sheet and the Question Booklet is to be returned to the invigilator after both the candidate and invigilator have signed. No candidate is allowed to leave the Examination Hall till the examination session is over. The mesencephalic nucleus of trigeminal nerve is made up of A) Unipolar neurons C) Bipolar neurons B) Pseudounipolar neurons D) Multipolar neurons 3. A) Lateral geniculate body C) Medial lemniscus B) Trapezoid body D) Spinal lemniscus 4. The most important regulator of Aldosterone secretion is A) Blood volume C) Na+ ion conc. The substitution of which amino acid on -chain of adult haemoglobin HbA leads to Sickle Cell disease? The mineral required for activity of enzyme cytochrome oxidase is A) Zinc C) Copper B) Manganese D) Molybdenum 11. Ratio of Insulin: Glucagon is increased in A) Early fasting state C) Overnight fasting state 13. Dirck granulomas are seen in A) Tuberculosis C) Syphilis -5- 11 B) Malaria D) Leprosy 16. The thyroid neoplasm diagnosed on the basis of nuclear features only is A) Papillary carcinoma C) Anaplastic carcinoma B) Follicular carcinoma D) Medullary carcinoma 17. Which of the following is a rapid and inexpensive method for diagnosis in a women presenting with painful genital blisters? Acute haemorrhagic conjunctivitis is caused by A) Enterovirus 72 C) Norwalk virus 21. Evaluation of health services comes under one of the following epidemiological techniques A) Non randomized experiments B) Randomized controlled trials C) Before and after studies without comparison D) Natural experiments 27. An attribute or exposure, that is significantly associated with development of disease is known as A) Predisposing factor C) Risk factor B) Augmenting factor D) Aetiological factor 28. While taking dying declaration, the patient must have A) compos mentis C) mens rea B) corpus delicti D) novus actus 31. Hormone that remains stable with aging is A) Insulin C) Glucagon like peptide 1 B) Insulin growth factor D) Vasoactive intestinal peptides 34. Lesions of the posterior column causes A) Anaesthesia C) Ataxia B) Rigidity D) Paralysis 36. Thyrotoxicosis during pregnancy should be treated with A) Neomercazole C) Propylthiouracil B) Carbimazole D) Radioactive iodine 42. Sweety feet, acrid urine odour is seen in A) Multiple carboxylase deficiency B) Phenylketonuria C) Glutaric acidemia D) Isovaleric acidemia -9- 11 46. Earliest neurological signs in Megablastic anemia is A) Memory loss C) Neuropsychiatric symptoms B) Confusion D) Loss of position sense 50. Gluten sensitive enteropathy occurs in A) Pemphigus Vulgaris C) Bullous Pemphigoid 53. Groove sign of Greenblatt is seen in A) Lymphogranuloma venereum B) Donovanosis C) Chancroid D) Condyloma acuminata 54. Which of the following is an absolute contraindication for Electroconvulsive therapy? Which of the following hernias follows the path of the spermatic cord and within the cremastic muscle? True about breast carcinoma in men A) Estrogen receptor positive with gynacomastia B) Progesteron receptor positive with gynacomastia C) Radiotherapy contraindicated due to close proximity to chest wall D) Seen in young males 63. Moderately increased risk of invasive breast carcinoma is associated with which of the following lesions? Haematemesis due to repetitive and strenuous vomiting is called as A) Mallory Weiss syndrome C) Boerhaave syndrome 67. Late dumping in peptic ulcer surgery is due to A) Hyponatremia C) Hypoglycemia B) Sympathetic over activity D) Hyperglycemia 73. Chronic granulomatous lesion amoeboma is most commonly seen in A) Caecam C) Sigmoid B) Transerverse colon D) Rectum 74. Operative treatment for displaced # Galeazzi in a adult at metaphyseal-diaphyseal junction is A) Nailing C) Close reduction, casting B) Plating D) Open reduction, casting 75. Compression neuropathy of median nerve below transverse carpal ligament is A) Anterior interosseus syndrome B) Pronator syndrome C) Carpal tunnel syndrome D) Dequervans disease 76.
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This results in hydration of the cornea with stromal edema and epithelial bullae mens health 100 order penegra 50mg. Symptoms: the gradual loss of endothelial cells causes slow deterioration of vision prostate cancer 13 order penegra pills in toronto. The patient typically will have poorer vision in the morning than in the evening mens health x factor 100 mg penegra sale, as corneal swelling is greater during the night with the eyelids closed prostate oncology times purchase generic penegra online. Diagnostic considerations: Slit lamp examination will reveal thickening of the cornea prostate yellow sperm buy penegra 100 mg with amex, epithelial edema prostate cancer awareness month purchase discount penegra, and epithelial bullae. In comparison, the left side (a wideangle view) and the middle (magnified view) of the image show an intact endothelium with a clearly visible honeycomb structure. It occurs as a result of lipid deposits from the vessels of the limbus along the entire periphery of the cornea, which normally increase with advanced age. Patients younger than 50 years who develop arcus senilis should be examined to exclude hypercholesteremia as a cause. The deposits and pigmentations discussed in the following section do not generally impair vision. This corneal change typically occurs with the use of certain medications, most frequently with chloroquine and amio- Arcus senilis. Systemic gold therapy (more than 1 2 g) will lead to gold coloration of the peripheral corneal stroma (chrysiasis). Iron deposits form in a characteristic manner at this site in the corneal epithelium. Iron lines have also been described following surgery (radial keratotomy; photorefractive keratectomy; keratoplasty) and in the presence of corneal scars. This ring is so characteristic that the ophthalmologist often is the first to diagnose this rare clinical syndrome. All are noninfectious and lead to thinning and melting of the peripheral cornea that may progress to perforation. Etiologic factors include: O Autoimmune processes (collagenosis, marginal keratitis, and sclerokeratitis). Keratomalacia is a special form of the disorder in which vitamin A deficiency causes xerosis of the conjunctiva combined with night blindness. This disorder remains one of the most frequent causes of blindness in the developing countries in which malnutrition is prevalent. Classification: the following forms of dystrophy are differentiated according to the individual layers of the cornea in which they occur: O Epithelial corneal dystrophy. Symptoms and diagnostic considerations: All patients suffer from a steadily increasing loss of visual acuity due to the generally gradual opacification of the cornea. This loss of visual acuity may progress to the point where a corneal transplant becomes necessary. Macular dystrophy is the most rapidly debilitating form of the stromal dystrophies, resulting in a severe loss of visual acuity in the second decade of life. Epithelial and stromal corneal dystrophies are also often accompanied by painful and recurrent corneal erosion. Treatment: Depending on the severity of the loss of visual acuity (see above), a corneal transplant (penetrating keratoplasty; see p. Where the symptoms are not too far advanced, frequent application of hyperosmolar solutions can remove water from the cornea. O Curative corneal procedures are intended to improve vision by eliminating corneal opacification. Therapeutic procedures Penetrating keratoplasty Lamellar keratoplasty 151 a Phototherapeutic keratectomy b c Refractive procedures Photorefractive keratectomy Radial keratotomy d Keratotomy correction of astigmatism 46. A clear, regularly refracting button of donor cornea is placed in an opacified or irregularly refracting cornea. Emergency keratoplasty is indicated to treat a perforated or nonhealing corneal ulcer to remove the perforation site and save the eye (tectonic keratoplasty). Indications: Corneal diseases that affect the full thickness of the corneal stroma (corneal scars, dystrophy, or degeneration) or protrusion anomalies such as keratoconus or keratoglobus with or without central corneal opacification. The donor corneal button is then sutured with one or two continuous sutures or with interrupted sutures. Indications: Corneal opacifications and scars affecting the superficial corneal stroma (post-traumatic, degenerative, dystrophic, or postinflammatory opacifications). Allograft Rejection (Complications): Allograft rejection is less frequent than in the case of penetrating keratoplasty. There is also less danger of infection as lamellar keratoplasty does not involve opening the globe. The lesion is excised parallel to the surface of the cornea to avoid refractive effects. The edges of the ablated area are merged smoothly with the rest of the corneal surface, eliminating any irregularities. However, this method is only suitable for ablation of relatively superficial corneal opacifications, i. Disadvantage: Despite attempting ablation parallel to the surface of the cornea, phototherapeutic keratectomy often creates a hyperopic effect. Flattening the corneal curvature corrects myopia, whereas steepening the curvature corrects hyperopia. The amount of tissue removed at different sites can be varied with layer-by-layer excimer laser ablation and the use of apertures. This makes it possible to correct for myopia, by removing more tissue from the center of the cornea, or for hyperopia, by removing more tissue from the periphery. Indications: Best results are achieved in correcting myopia of less than 6 diopters. At present stable correction can be achieved in 85 95% of all cases of myopia up to! This increases the steepness of the corneal periphery and lowers the center of the cornea, reducing its refractive power. Indications and prognosis: the method is suitable for moderate myopia (less than 6 diopters). This flattens the dome of the central cornea and increases the steepness of the corneal periphery. Placing these areas symmetrically steepens the central cornea, which can correct severe hyperopia. The donor corneal button is prepared as a frozen section and shaped to the required refractive power; these implants can be ordered from eye banks. The keratome is withdrawn, the flap is reflected, and the exposed underlying corneal stroma is ablated with an excimer laser to correct the myopia. Then the flap is repositioned on the corneal bed and fixed in place by force of its own adhesion. Indication: Even severe myopia (up to 10 12 diopters) can be corrected with this method. Morphology: the sclera is fibrous, whitish opaque, and consists of nearly acellular connective tissue with a higher water content than the cornea. The sclera is thickest (1 mm) anteriorly at the limbus of the cornea where it joins the corneal stroma and at its posterior pole. The site where the fibers of the optic nerve enter the sclera is known as the lamina cribrosa. In the angle of the anterior chamber, the sclera forms the trabecular network and the canal of Schlemm. The aqueous humor drains from there into the intrascleral and episcleral venous plexus through about 20 canaliculi. Neurovascular supply: Vortex veins and the short anterior and posterior ciliary arteries penetrate the sclera. Evaluation of the sclera posterior to the equator requires indirect methods such as ultrasound. Transillumination can provide evidence of possible abnormal changes in the posterior sclera. Altered color suggests one of the following changes: O Conjunctival and/or ciliary injection and inflammation will give the sclera a red appearance. By far the most common form is posterior staphyloma in severe myopia, a bulging of the entire posterior pole of the eyeball. Ectasia is a thinning and bulging of the sclera without uveal involvement, as can occur secondary to inflammation. Deep injuries that extend far posteriorly usually also involve the choroid and retina. Surgery to treat larger injuries extending 8 mm past the limbus should also include a retinal repair (retinal cryopexy or retinal tamponade. They more often involve the anterior sclera (episcleritis and anterior scleritis) than the posterior sclera (posterior scleritis). Classification: Forms of scleral inflammation are differentiated as follows: O Location: anterior or posterior, i. Etiology: Episcleritis is rarely attributable to one of the systemic underlying disorders listed in Table 6. It is usually associated with segmental reddening and slight tenderness to palpation. In episcleritis, these vessels and the conjunctival vessels above them become hyperemic. Differential diagnosis: the disorder should be distinguished from conjunctivitis (see next paragraph) and scleritis (6. When vasoconstrictive eyedrops are applied, the conjunctival injection will disappear but not the episcleral injection. Treatment and prognosis: Episcleritis usually resolves spontaneously within one to two weeks, although the nodular form can persist for extended periods of time. Severe symptoms are treated with topical steroids (eyedrops) or with a nonsteroidal anti-inflammatory agent. Scleritis is classified according to location: Anterior (inflammation anterior to the equator of the globe). Anterior scleritis is further classified according to its nature: O Non-necrotizing anterior scleritis (nodular or diffuse). Etiology: Approximately 50% of scleritis cases (which tend to have severe clinical courses) are attributable to systemic autoimmune or rheumatic disease (Table 6. As with episcleritis, scleritis is only occasionally due to bacterial or viral inflammation. Symptoms and findings: All forms except for scleromalacia perforans are associated with severe pain and general reddening of the eye. The nodules consist of edematous swollen sclera and are not mobile (in contrast to episcleritis). It can be limited to a certain segment or may include the entire anterior sclera. There may be deviation or injection of the blood vessels of the affected region, accompanied by avascular patches in the episcleral tissue. As the disorder progresses, the sclera thins as the scleral lamellae of collagen fibrils melt, so that the underlying choroid shows through. This form of scleritis typically occurs in female patients with a long history of seropositive rheumatoid arthritis. The clinical course of the disorder is usually asymptomatic and begins with a yellow necrotic patch on the sclera. As the disorder progresses, the sclera also thins so that the underlying choroid shows through. Sometimes there will be no abnormal findings in the anterior eye, and pain will be the only symptom. Associated inflammation of the orbit may result in proptosis (exophthalmos) and impaired ocular motility due to myositis of the ocular muscles. Intraocular findings may include exudative retinal detachment and/or choroid detachment. The reddening in scleritis is due to injection of the deeper vascular plexus on the sclera and to injection of the episclera. If corticosteroids do not help or are not tolerated, immunosuppressive agents may be used. As no effective treatment is available, grafts of preserved sclera or lyophilized dura may be required to preserve the globe if the course of the disorder is fulminant. The curvature of the posterior surface, which has a radius of 6 mm, is greater than that of the anterior surface, which has a radius of 10 mm. Weight: the lens is approximately 4 mm thick, and its weight increases with age to five times its weight at birth. Position and suspension: the lens lies in the posterior chamber of the eye between the posterior surface of the iris and the vitreous body in a saucershaped depression of the vitreous body known as the hyaloid fossa. Together with the iris it forms an optical diaphragm that separates the anterior and posterior chambers of the eye. Radially arranged zonule fibers that insert into the lens around its equator connect the lens to the ciliary body. Embryology and growth: the lens is a purely epithelial structure without any nerves or blood vessels. It moves into its intraocular position in the first month of fetal development as surface ectoderm invaginates into the primitive optic vesicle, which consists of neuroectoderm. A purely ectodermal structure, the lens differentiates during gestation into central geometric lens fibers, an anterior layer of epithelial cells, and an acellular hyaline capsule. The normal direction of growth of epithelial structures is centrifugal; fully developed epithelial cells migrate to the surface and are peeled off. The youngest cells are always on the surface and the oldest cells in the center of the lens.
It is generally accepted that a paraganglioma is malignant only when metastasis to non-neuroendocrine tissue is demonstrated prostate yoga poses buy penegra in india. Most commonly prostate queen arizona 100mg penegra fast delivery, paragangliomas spread regionally to the cervical lymph nodes or distantly to the lung hormone androgen deprivation therapy for prostate cancer buy generic penegra 50mg on-line, the liver prostate radiation side effects buy penegra 100 mg low price, or the skin androgen hormone test cheap 100 mg penegra. The most common presenting symptom of a vagal paraganglioma is a mass in the neck mens health aus discount 50 mg penegra with mastercard, often associated with hoarseness. The most common presenting symptom of a carotid paraganglioma is a mass located at the carotid bifurcation that is horizontally mobile, but vertically immobile. Angiography with preoperative embolization minimizes bleeding as well as injury to the adjacent cranial nerves. The patient and the surgeon must consider that these tumors are often benign and slow growing. Surgical resection may convert an asymptomatic patient to a patient with significant impairments of speech and deglutition. Observation may be warranted unless there is an increased suspicion for malignancy. Patients fare better when given time to accommodate to a slowly progressive loss rather than to an acute iatrogenic paralysis. Radiation therapy can prevent further growth in many patients; however, late tumor progression can occur. Radiation does not reduce paraganglioma volume by the destruction of tissue; rather it induces fibrosis and decreases the fine vasculature of the tumor. In addition, poor surgical candidates (based on comorbidities, tumor size, tumor recurrence, or any combination of these factors) may elect radiation therapy for local control or symptomatic relief. The submandibular gland may be removed and the digastric tendon divided if additional exposure is required. A superficial parotidectomy is performed and then the deep lobe of the parotid gland is dissected free from the facial nerve. Retraction of the posterior belly of the digastric muscle permits the division and ligation of the facial artery, allowing the submandibular gland to be retracted anteriorly. Lysis of the stylomandibular ligament enhances exposure; the neoplasm is then mobilized from the wound in a three-dimensional fashion. This approach provides exposure and vessel control for vascular tumors extending to the skull base. After flap elevation and identification of the ramus mandibularis, direct access to the post-styloid space is gained without dissecting the submandibular triangle. Complications Paragangliomas account for most of the surgical morbidity (Table 215). There is a significant incidence of permanent deficits when operating on these neoplasms. A rehabilitation plan should be outlined with the patient and with family members who will aid in the support of the patient. The rehabilitation of a vagal paraganglioma may consist initially of augmentation by vocal fold injection with subsequent B. Benign neurilemomas, soft tissue tumors, and salivary gland neoplasms are typically associated with less morbidity and rare recurrence compared with paragangliomas. Recurrence of pleomorphic adenomas may be re-resected, followed by postoperative radiation therapy to improve local control. Alternately, neutron beam therapy for multiply recurrent pleomorphic adenoma may be considered. Recurrent headand-neck chemodectomas: a comparison of surgical and radiotherapeutic results. Surgical resection for recurrent carotid body tumors produced excellent local control. Commonly affected spatial compartments are the retropharyngeal, parapharyngeal, and submandibular spaces. The deep layer of cervical fascia is further divided into three layers: superficial, middle, and deep. The superficial portion of the deep cervical fascia envelops the sternocleidomastoid and trapezius muscles. It extends superiorly to the hyoid bone where it surrounds the submandibular gland and the mandible. Inferiorly, it attaches to the clavicle and, medially, it forms the floor of the submandibular space as it covers the muscles of the floor of mouth. The middle layer of deep cervical fascia, also known as the visceral or pretracheal fascia, surrounds the infrahyoid strap muscles, the thyroid, the larynx, the trachea, and the esophagus. Above the hyoid, this layer continues on the posterior pharyngeal wall as the buccopharyngeal fascia. Between the middle and deep layers of deep cervical fascia is the retropharyngeal space. The deep layer of cervical fascia, also known as the prevertebral fascia, surrounds the prevertebral muscle. Anteriorly, the deep layer of cervical fascia divides to form a thin alar layer and a thicker prevertebral layer. Between these two layers is the "danger space," extending from the skull base to the diaphragm. The submandibular space is bound in four ways: (1) anteriorly by the mandible, (2) superiorly by the mucosa of the floor of mouth, (3) inferiorly by the superficial layer of the deep cervical fascia, and (4) posteriorly by the parapharyngeal space. The mylohyoid muscle further divides this space into the submaxillary space (below the mylohyoid muscle) and sublingual space (above the mylohyoid muscle). An understanding of this complex Deep space infections of the head and neck are problems encountered by both primary care physicians and otolaryngologists. Despite the wide use of antibiotics to treat early infections of the head and neck, infectious organisms still cause abscesses. Controversy exists concerning the choices of empiric antimicrobial therapy, imaging modalities, and medical versus surgical treatment. The successful management of these potentially life-threatening infections depends on an understanding of the anatomy of the cervical fascial planes and spaces, bacteriology, and the potential complications that may arise. However, given that it is a late finding associated with the breakdown of the lymph node or abscess wall, its sensitivity is only 60%. Ultrasound may be a more effective means of distinguishing an abscess from cellulitis. This combination of information is important in determining the safest surgical approach to ensure complete drainage. The clinician is often limited by its availability, but it is of obvious benefit in patients with renal dysfunction or contrast allergies. Patients should be asked about a history of tonsillitis and peritonsillar abscess. A history of trauma to the retropharynx, either by intubation or the swallowing of a chicken or a fish bone, may lead the clinician to suspect a retropharyngeal abscess. Sialadenitis, dental caries and abscess, or localized cutaneous infections may lead to infections afflicting the submandibular space. An upper respiratory tract infection in the absence of other symptoms may be the only source of a necrotic parapharyngeal or retropharyngeal node. Diabetes, immunodeficiencies, or immunosuppression may contribute to the severity and the progression of disease. Generally, these patients tend to present with fever and leukocytosis, as well as signs and symptoms affecting the aerodigestive tract, including odynophagia, dysphagia, trismus, and dyspnea. On the physical exam, a parapharyngeal space abscess pushes medially to the tonsil and the lateral pharyngeal wall. Alternately, posterior wall swelling may be noted with a retropharyngeal space abscess. Leukocytosis is common and an increased hematocrit count may be suggestive of dehydration. Blood cultures should be drawn and sent before administering the first dose of antibiotics, especially if the imaging is suggestive of cellulitis rather than abscess. Differential Diagnosis the differential diagnosis of a patient with fever, sore throat, and neck mass includes a broad spectrum of disorders. The diagnoses include pharyngitis with lymphadenopathy, suppurative lymphadenopathy, infected branchial cleft cyst, and deep neck abscess. Patients who present without fever or tenderness but with evidence of centrally hypodense lymph nodes should alert the physician to consider other less common entities such as mycobacterial infection, undiagnosed metastatic thyroid malignancy, and squamous cell carcinoma. Features of ring enhancement around a hypodense center have yielded a sensitivity of 8795% and a specificity of 6092% in Treatment the airway should be assessed on initial evaluation. If compromised, plans should be made for an immediate local tracheotomy or a fiberoptic intubation. Patients with equivocal radiographic findings (low or heterogeneous lesions without ring enhancement) may initially be treated with antibiotics alone. Common organisms from deep neck infections include Staphylococcus, Streptococcus, and Bacteroides melaninogenicus. Because of the increased incidence of penicillin resistance, antibiotics should cover gram-positive and anaerobic bacteria. The surgical approach taken depends on the cause and the anatomic involvement of the infection. Thus, an abscess in the retropharyngeal space of an adult typically results from either trauma or the secondary spread of infection from a separately infected space. Because these pediatric abscesses typically originate in a lymph node, they are usually well contained in an inflammatory rind. Most pediatric otolaryngologists advocate transoral drainage for a patient with an infection of a retropharyngeal space abscess medial to the great vessels when it represents a confined process with no evidence of spread along the fascial planes. Abscesses with extension lateral to the great vessels may require transcervical or combined approaches for adequate drainage; these approaches may also be necessary in treating deep neck abscesses in adult patients. Meningitis and cavernous sinus thrombosis have been reported as rare complications of these infections. Radiographic imaging, which allows for an earlier accurate diagnosis and appropriate intervention, has made this a rare sequela. Sepsis and septic emboli frequently ensue and affect the lungs, the musculoskeletal system, and, occasionally, the liver. The treatment generally consists of -lactamase-resistant antibiotics with good anaerobic coverage. Surgical intervention is indicated when there is a lack of improvement after 4872 hours of intravenous antibiotics. The oropharynx is posterior to the oral cavity and includes the posterior third of the tongue, also called base of tongue or lingual tonsil, palatine tonsil, soft palate, and posterior pharyngeal wall. These lesions are often silent in early stages and are frequently advanced at the time of presentation. Cancer of the oropharynx occurs in 8750 patients in the United States each year, resulting in approximately 4250 deaths. Verrucous carcinoma is a type of squamous cell carcinoma that is low grade and rarely metastasizes. Minor salivary glands found throughout the oral cavity and the oropharynx can give rise to adenocarcinoma, adenoid cystic carcinoma, mucoepidermoid carcinoma, and polymorphous low-grade carcinoma. Leukoplakia and erythroplakia are white and red areas, respectively, which are abnormal, but not necessarily neoplastic. The seriousness of these lesions can be determined only by a biopsy with evaluation under the microscope. A precancerous lesion is termed dysplastic and describes malignant cells that have not invaded normal underlying epithelial tissues. Dysplasia is classified by its tendency to progress to cancer as mild, moderate, or severe. Dysplasia, in 356 General Considerations Cancer of the oral cavity includes several subsites: lip, anterior two thirds of the tongue, buccal mucosa, floor of mouth, hard palate, upper and lower gingiva, and retromolar trigone. There is an estimated annual incidence of 30,000 new oral cancers in the United States with approximately 4800 deaths per year. Men are affected 24 times more often than women for all racial and ethnic groups. Tobacco use (both chewing and smoking), alcohol, and poor oral hygiene are well-established causes of oral cavity cancer. Chewing betel nut, a common practice in Southeast Asia, is also a known cause of cancer of the buccal mucosa. Leukoplakia is usually a benign condition that is unlikely to progress into cancer (5%). Erythroplakia is more likely to advance to cancer at the time of the initial biopsy (51%). Clinically, early mucosal lesions appear as an indurated nodule or shallow ulcer with poorly defined margins. These tumors may become exophytic or infiltrative, expanding rapidly into underlying muscles, which results in difficulty with speech or eating. The incidence of lymph node involvement from cancers of the oral cavity is related to the site and size of the primary tumor. Cancers of the oral tongue and floor of mouth have a higher incidence of nodal metastases than do cancers of the lip, hard palate, and buccal mucosa. Cancers of the lip most commonly involve the lower lip and rarely proceed to lymphatic spread (510%). In the case of nodal spread from lip cancer, it is typically the submental and submandibular nodes that are involved. Lateral tongue, floor of mouth, and buccal cancers drain to the ipsilateral submandibular node as well as to the upper and mid-mandibular jugular nodes.