Los Angeles Monthly Meeting of the Religious Society Of Friends

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Neurogenic shock results from causes of interruption of sympathetic vasomotor supply. Depending upon the species studied, there are various disciplines of pathology such as human pathology, animal pathology, plant pathology, veterinary pathology, poultry pathology etc. At autopsy, lymph nodes are small with very few lymphocytes and no germinal centers. The normal order of closure is metopic first, followed by the coronal and then the lambdoid sutures. Most rotavirus infections are subclinical or cause mild gastrointestinal illnesses that do not require hospitalization. T cell receptors respond to peptide antigens to trigger a cell-mediated immune response. The gross pulmonary fibrosis caused by asbestos exposure and histologic demonstration of asbestos bodies on asbestos fibres is termed asbestosis. A widened, open, heartshaped tentorial incisura and thinned, hypoplastic, or fenestrated falx are frequent findings. Hematologic malignancies such as acute lymphocytic leukemia can be found in childhood. Inherited Vascular Bleeding Disorders A few examples of hereditary vascular disorders are given below: 1. In vitro tests of coagulation (prothrombin time and partial thromboplastin time) are prolonged. The process of dystrophic calcification has been likened to the formation of normal hydroxyapatite in the bone involving 2 phases: initiation and propagation. In long-standing cases, epithelial cytologic atypia ranging from mild to marked dysplasia and sometimes developing into carcinoma in situ and frank adenocarcinoma. Inhaled Pigments the lungs of most individuals, especially of those living in urban areas due to atmospheric pollutants and of smokers, show a large number of inhaled pigmented materials. Iron is stored in the tissues in 2 forms: Ferritin, which is iron complexed to apoferritin and can be identified by electron microscopy. A metaphase spread is shown in the figure, with probes to two different regions on chromosome 22. The findings of trisomy 21 are subtle at birth, but typically include brachycephaly, not microcephaly. Commissural and Cortical Maldevelopment the contralateral "normal" hemisphere are common and so should be carefully searched for as part of surgical planning. The processes of operculization, gyral and sulcal development, and the earliest steps in myelination all take place later, between gestational weeks 11 and birth. Metasatic calcification at the above-mentioned sites occurs due to excessive binding of inorganic phosphate ions with calcium ions, which are elevated due to underlying metabolic derangement. In the most severe forms, the cerebral hemispheres are smooth with poor operculization and underdeveloped sylvian fissures. In this, the left coronary artery supplies blood to the entire left ventricle, whole of interventricular septum and also supplies blood to a part of the posterior wall of the right ventricle by crossing the crux. The final section of this chapter suggests an approach to analyzing brain malformations. This causes thinning of the media, which weakens the wall and predisposes it to aneurysm formation. The clinical manifestations of bronchiectasis typically consist of chronic cough with foulsmelling sputum production, haemoptysis and recurrent pneumonia. The dural sinuses often appear distended with outwardly convex margins and exaggerated "flow voids" (34-49E). Malignant gastric ulcers are larger, bowl-shaped with elevated and indurated mucosa at the margin. Lymphogranuloma venereum is caused by Chlamydia trachomatis, which cannot be seen with Gram stain. Peripheral neuropathy is more characteristic of beriberi (thiamine deficiency) and deficiencies in riboflavin (vitamin B2) and pyridoxine (vitamin B6). In unilateral coronal synostosis, the hemicalvaria is shortened and pointed; it may be associated with a unilateral "harlequin" eye (41-21B). Tumour with histologic resemblance to ameloblastoma can occur occasionally in the long bone, like adamantinoma of the tibia (Chapter 28). Atrial myxoma Fibrinous pericarditis Giant cell myocarditis Libman-Sacks endocarditis Rheumatic valvulitis 3 A 66-year-old man has had cough and worsening shortness of breath for 3 years.

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A simple classification of important and common examples of these groups is given in Table 16. A variety of bacterial, viral, protozoal and fungal infections can be identified by cytologic methods. Lipopolysaccharides are elaborated by gram-negative organisms and produce endotoxic shock. The actin bands are in the form of twisted rods overlying protein molecules called tropomyosin. While the tensile strength in tissue comes from collagen, the ability to recoil is provided by elastic fibres. The control of gastric secretions chiefly occurs in one of the following 3 ways: 1. By 10 years, 50% of affected children demonstrate one or more globular or gyriform cortical calcifications. The mesenchymal tumours have mesenchymal tumour cells arranged as interlacing bundles, fasicles or whorls, lying separated from each other usually by the intercellular matrix substance such as hyaline material in leiomyoma. Asymptomatic carriers with chronic disease may show changes of chronic hepatitis and even cirrhosis. Oedema in these conditions is usually not affected by gravity (unlike cardiac oedema). Clinical features are oedema of lower extremities, dilated leg veins and collateral venous channels in the lower abdomen layer of endothelium have thin muscle in their walls than in veins of the same size and the valves are more numerous. However, tumours and tumour-like lesions which are specific to the ear are described below. Around the mass of epithelioid cells and giant cells is a zone of lymphocytes, plasma cells and fibroblasts. Marfan syndrome is a risk for aortic dissection starting in a dilated ascending aorta. All safety systems are backed-up by an independent second device acting in case of failure of the first. All have a hyperkeratotic, papular rash; ecchymoses; and severe gingival swelling with hemorrhages. Which of the following substances diminishes thrombus propagation by activating protein C On physical examination, petechiae and purpura are present on the skin of her extremities. Iron excreted in the faeces mainly consists of unabsorbed iron and desquamated mucosal cells. X-radiation from radiologic imaging is certainly a concern when patients receive multiple imaging studies, but the cumulative dosages remain small. Occasionally, certain drugs produce neutropenia due to individual sensitivity such as: anti-inflammatory (amidopyrine, phenylbutazone), antibacterial (chloramphenicol, cotrimoxazole), anticonvulsants, antithyroids, hypoglycaemics and antihistaminics. Echocardiography shows a 1-cm nodular lesion on the superior aspect of an intact anterior mitral valve leaflet. The condition begins in childhood and is characterised by abnormally telangiectatic (dilated) capillaries. Other lymph node groups like axillary, inguinal and abdominal are involved sometimes. Accidental exposure by contaminated water supply, house freshly coated with lead paint, and sniffing of leadcontaining petrol (hence unleaded petrol introduced as fuel). The contamination of a wound with Clostridium tetani can result in the elaboration of a potent neurotoxin. Structural anaplasia in tumours is accompanied with functional anaplasia as appreciated from the cytoplasmic constituents of the tumour cells. A Gram stain of the pharyngeal membrane shows numerous small, gram-positive rods within a fibrinopurulent exudate. Clinical observations include macrocrania, coarse facies, bushy eyebrows, macroglossia, flat nasal bridge, hepatosplenomegaly, and skeletal dysostoses. Though it is a continuous process, secondary bone union is described under the following 3 headings: i) Procallus formation ii) Osseous callus formation iii) Remodelling these processes are illustrated in. However, they are more active in chronic inflammation than acting as mediators of acute inflammation. The various clinical patterns and pathologic consequences of different hepatotropic viruses can be considered under the following headings: i) Carrier state ii) Asymptomatic infection iii) Acute hepatitis iv) Chronic hepatitis v) Fulminant hepatitis (Submassive to massive necrosis) In addition, progression to cirrhosis (page 624) and association with hepatocellular carcinoma (page 634) are known to occur in certain types of hepatitis which are discussed separately later.

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The latter event (integration) results in inducing mutation and thus neoplastic transformation of the host cell, while the former (replication) brings about cell death but no neoplastic transformation. Alteration in Pco2 (which depends upon the ventilatory function of the lungs): these are respiratory acidosis and alkalosis. Myelin sheaths can rupture and split when osmotic stress on oligodendrocytes is severe. Conotruncal cardiac defects, pulmonary valvular stenosis, and arterial hyperplasia are typical anomalies. Within 24 to 48 hours there is focal erythema and induration of their skin, accompanied by itching and pain. The skin in this location is in direct contact with the cartilage without protective subcutaneous layer. Late in the course of disease, lesions at several extraosseous sites become evident. Other affected locations include the corpus callosum, optic radiations, fornices, and cerebellar peduncles. Many enteroviruses also produce diarrhea by inhibiting the intestinal absorption of intraluminal sodium and water, but not as severe. Another form of dystrophic calcification occurs when atherosclerotic lesions calcify. The most common additional anomalous connections would be ventricular septal defect, patent ductus arteriosus, and patent foramen ovale (or atrial septal defect). The atherosclerotic plaques in the coronaries are more often eccentrically located bulging into the lumen from one side. This organism can be devastating because it produces bone marrow suppression, and because any antibodies to the virus enhance cellular viral uptake. This is another related stress protein which has ubiquitous presence in human body cells. The cataract is the opacification of the normally crystalline lens which leads to gradual painless blurring of vision. Some cases demonstrate subtle hypointensity in the affected areas, whereas others show T1 shortening similar to that seen in chronic hepatic encephalopathy (see Chapter 32). Just as in lungs, infarcts in the liver are uncommon due to dual blood supply-from portal vein and from hepatic artery. C, Smooth muscle cell proliferation into the intima and ingrowth of new blood vessels. The area of the tick bite that introduces Borrelia burgdorferi spirochetes, the cause of Lyme disease, may manifest erythema chronicum migrans. Microscopically, the tumour is composed of undifferentiated retinal cells with tendency towards formation of photo-receptor elements. Atherosclerosis, affecting small, peripheral branches of the coronary arteries, can be marked with chronic use. It is characterised by diffuse non-specific inflammatory infiltrate consisting of lymphocytes, plasma cells, macrophages, eosinophils and a few polymorphs in the interstitial tissue without formation of granulomas. Continued support for advocating autopsy by caring physicians as well as by discernible pathologists in tertiarycare hospitals is essential for improved patientcare and progress in medical science. The peak incidence of duodenal ulcer is in 5th decade while that for gastric ulcer is a decade later. The subepithelium has fibromyxoid appearance and contains proliferating blood vessels some of which are hyalinised. Arsenic Beryllium Cadmium Lead Mercury 13 While attending a party, a 19-year-old university student drinks 2 L of mixed alcoholic beverages containing 50% ethanol by volume over 30 minutes. A few variants of morphological forms and other epithelial cells are as under: Navicular cells are boat-shaped intermediate cells with folded cell borders. The general status of an individual as regards cardiovascular function is an important determinant to assess the effect of ischaemia. Rarely lung abscesses may occur from following causes: i) Infection in pulmonary infarcts.

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More lateral sections through the hemispheres show the dentate nuclei, the brachium pontis, and the primary fissure of the cerebellum. The most severe is anencephaly-essentially complete absence of the cerebral hemispheres-which is caused by failure of the anterior neuropore to close (see Chapter 38). Moving posteriorly, the rhomboid or diamond shape of the fourth ventricle can be appreciated. Salient features of retinoblastoma are contrasted with those of uveal melanoma in Table 18. Hyaluronate capsule of group A streptococcus is identical to human hyaluronate present in joint tissues and thus these tissues are the target of attack. Two morphologic configurations of interhemispheric fissure lipomas are recognized on imaging studies: a curvilinear type (a thin, pencil-like mass that curves around the corpus callosum body and splenium) and a tubulonodular type (a large, bulky interhemispheric fatty mass). These weighting factors should be used as one set, because the nitrogen and fast neutron weighting factors are calculated assuming the gamma weighting factor one and the nitrogen and fast neutron equal [38]. In mosaic individuals, greater numbers of potentially normal cells having the proper chromosomal complement are present, which may allow infants with abnormalities of chromosome number to survive to term and beyond. The bilirubin concentration in the term infant in this case is not high enough to produce kernicterus. In this new protocol a stratifying criteria was established which separated the patients into two groups. Combinations of these three patterns as well as involvement of other anatomic areas (see below) are also common. Thyroglossal cyst arises from the vestiges of thyroglossal duct that connects the foramen caecum at the base of the tongue with the normally located thyroid gland. It is synthesised in the melanocytes and dendritic cells, both of which are present in the basal cells of the epidermis and is stored in the form of cytoplasmic granules in the phagocytic cells called the melanophores, present in the underlying dermis. Medication or I-131 therapy for maternal hyperthyroidism or cancer can also act adversely on the fetus. But subsequently, in addition to features of the underlying disorder causing the anaemia, the clinical consequences of iron deficiency manifest in 2 ways-anaemia itself and 3. The alveolar epithelium consists of 2 types of cells: type I or membranous pneumocytes are the most numerous covering 462 2. Kallikrein may aid in generation of bradykinin and plasmin, but participates just in complement C5a generation. Gene therapy of thalasaemia involving genetic manipulation in haematopoieitc stem cells may become an option for future. Soon she begins to note that her concentration is fading because 7 hours have passed since she had dinner, and she is feeling famished. A mature megakaryocyte is a large cell, 30-90 m in diameter, and contains 4-16 nuclear lobes having coarsely clumped chromatin. Neural structures in the posterior fossa are derived from the embryonic hindbrain (rhombencephalon), whereas the mesencephalon gives rise to midbrain structures. Other forms are those in which glycogen storage does not occur by either hepatic or myopathic mechanisms. Centrioles are cylindrical structure composed of electron-dense evenly-shaped microtubules. The accepted clinical axiom has been that, in diabetics, it is better to err on the side of having high blood glucose because of the greater risk of brain and physical injury associated with severe hypoglycemia. Dopamine transporter (DaT) radioligands show uniformly decreased dopamine nerve terminals in both the caudate nuclei and Dementias and Brain Degenerations putamen. Non-sterile aspirate causes widespread bronchopneumonia with multiple areas of necrosis and suppuration. Cavernous lymphangiomas can be deforming mass lesions in the neck region of children, and though technically benign they do not have well-defined borders and can be difficult to excise. Relations of weighted reference target and normal brain dose components in the human head. The tumour may show varying histologic grades of differentiation such as well-differentiated, moderately-differentiated and poorlydifferentiated. There is mild upper abdominal tenderness on palpation, and bowel sounds are present. Note reduced metabolism in the right temporal lobe, possibly reflecting chronic subclinical mirroring seizures.

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The gross and microscopic appearances of the hearts are correlated with the degree of coronary atherosclerosis and its complications, clinical symptoms, and therapies given before death. Chromosomal translocations may be seen with other tumors, such as chronic myelogenous leukemia, acute promyelocytic leukemia, and Burkitt lymphoma. The chancres are characterized by lymphoplasmacytic infiltrates and by an obliterative endarteritis. Normal bilirubin metabolism and pathogenesis of jaundice are described in Chapter 21. Although peripheral vascular disease with atherosclerosis is a typical finding in diabetes mellitus, vasculitis is not. Following possible mechanisms have been suggested: There is consistent association with heavy cigarette smoking. In the late acute/early subacute phase, the affected areas are swollen and edematous (32-15C) (32-15D). Gastrointestinal tract adenocarcinomas, including those arising in the stomach, colon, and pancreas, as well as some lung carcinomas, may be accompanied by elevations in the serum carcinoembryonic antigen level. The amount of exudate is variable and is generally thick, creamy pus, coating the pericardial surfaces. A number of inherited disorders of the red cell membrane and cytoskeletal components produce abnormalities of the shape such as: spherocytosis (spherical shape from loss of part of the membrane), ovalocytosis (oval shape from loss of elasticity of cytoskeleton), echinocytosis (spiny processes from external surface due to metabolic abnormalities of red cells), and stomatocytosis (bowl-shaped red cells from expansion of inner membrane on one side). For example: Lungs are perfused by bronchial circulation as well as by pulmonary arterial branches. Niemann-Pick Disease this is also an autosomal recessive disorder characterised by accumulation of sphingomyelin and cholesterol due to defect in acid sphingomyelinase. The periphery of the expanded gyrus is isointense with cortex while the deeper component is strikingly hyperintense. Atherosclerotic plaques with superimposed thrombosis and intramural haemorrhage are significant in about 90% cases, and non-atherosclerotic causes in the remaining 10% cases. Following a period of worsening neurological symptoms the patient died in December 1998 due to tumour progression. Phlebothrombosis leads to swelling with pain and tenderness, but it is uncommon in the upper extremities. There is positive immunofluorescence at the dermalepidermal junction with staining for IgG and complement C3. About 10 to 20 mg of iron per day is lost with normal desquamation of epithelia; menstruating women lose slightly more. Laparotomy reveals a distended, fluid-filled, reddened left fallopian tube that is about to rupture. This form of necrosis involves small groups of hepatocytes irregularly distributed in the hepatic lobule. The branch of science dealing with the study of human chromosomal abnormalities is called cytogenetics (discussed in Chapter 2). At autopsy, a cystic leukoencephalopathy is observed with both axons and myelin sheaths absent. In adults, demyelinating peripheral motor neuropathy which typically affects radial and peroneal nerves resulting in wristdrop and footdrop respectively. The interface between viable and non-viable area shows nonspecific chronic inflammation and proliferating vessels. A chest radiograph shows a prominent border on the right side of the heart and prominence of the pulmonary arteries. After deflation, the 329 number of petechiae appearing in the next 5 minutes in 3 cm2 area over the cubital fossa are counted. An abdominal ultrasound scan shows that his kidneys are symmetrically smaller than normal.

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Tay-Sachs disease involves a deficiency of hexosaminidase A and is associated with severe mental retardation and death before 10 years of age. Physical examination now shows some swelling and tenderness of the right leg, which worsens when she raises or moves the leg. Battered children typically have multiple contusions and fractures, but the skin and bone structure are normal. The stools of such patients are clay-coloured due to absence of bilirubin metabolite, stercobilin, in faeces and there is virtual disappearance of urobilinogen from the urine. The classic triad of dementia, gait disturbance, and urinary incontinence is present in a minority of patients and typically represents advanced disease. The substances acting as chemical mediators of inflammation may be released from the cells, the plasma, or damaged tissue itself. Which of the following factors most likely accounts for the appearance of these lymph nodes Aging effects Bleeding disorder Cigarette smoking Liver failure Multiple metastases 38 A 70-year-old man with hypercalcemia died suddenly. Disseminated intravascular coagulation more often results in hemorrhage, and edema is not the most prominent manifestation. Besides Schilling test, another way of distinguishing whether megaloblastic anaemia is due to cobalamine or folate is by serum determination of methylmalonic acid and homocysteine by sophisticated enzymatic assays. Mild anaemia; mean haemoglobin level is about 15% lower than in normal person for the age and sex. In myxomatous degeneration of the mitral valve leaflets (floppy valve syndrome) which is described on page 451, there is prolapse of one or both leaflets into the left atrium during systole. We begin with skull base embryology, which is key to understanding the malformations discussed. The program uses this option to calculate the 197Au(n,g) and 55Mn(n,g) reaction rates in the diluted Au-Al and Mn-Al foils in the model. Physical examination shows generalized edema, ascites, muscle wasting, and areas of desquamating skin over the trunk and extremities. Other causes of arrhythmias include leakage of K+ from ischaemic muscle cells and increased concentration of lactate and free fatty acids in the tissue fluid. Polyglutamate form in the foodstuffs is first cleaved by the enzyme, folate conjugase, in the mucosal cells to mono- and diglutamates which are readily assimilated. Paraseptal or distal acinar emphysema is localised along the pleura and along the perilobular septa. Trauma is not a risk factor for development of cancer, although traumatic episodes often are recalled and irrationally associated with subsequent health problems. In contrast, prostaglandin production depends on a functioning cyclooxygenase pathway of arachidonic acid metabolism. An atypical clinical presentation is behavioral and psychiatric disorders, speech delay, and pyramidal and extrapyramidal disturbance. The microorganisms gain entry into the lungs by one of the following four routes: 1. These values would give the total weighted reference dose rate of 15 Gy (W)/h (=1. Lymphangiomas are congenital lesions which are classified as capillary, cavernous and cystic hygroma. Histologically, there is extensive infiltration by foamy histiocytes containing the organisms (Mikulicz cells) and other chronic inflammatory cells like lymphocytes and plasma cells. Depending on the size of the cephalocele, severe traction and distortion of the brainstem and supratentorial structures can be present. Ectopic parathyroid glands are found in 2% of cases, typically just below the inferior thyroid pole, although they can be found from the upper neck to the mediastinum. Maldifferentiation and persistence of the meninx was thought to result in deposits of mature adipose tissue, i. In adults, both sexes are affected equally but in children there is 2:1 malefemale ratio. Chikungunya Virus Infection the word chikungunya means "that which bends up" and is derived from the language in Africa where this viral disease was first found in human beings.

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Cell wall polysaccharide of group A streptococcus forms antibodies which are reactive against cardiac valves. The primary site may be difficult to detect if small or deep, and hence the need for radiologic imaging, such as mammography. Ameloblastic Fibroma this is a benign tumour consisting of epithelial and connective tissues derived from odontogenic apparatus. Low-grade gliomas do not generally shed sufficient cells although highgrade gliomas may yield adequate cellular material for diagnosis. Sometimes, angina pectoris occurs due to increased myocardial demand or due to coronary insufficiency. Microabscesses may be present with an infectious process, or with thromboangiitis obliterans (Buerger disease), which typically involves lower extremities. These stem cells have the properties of prolonged self-renewal, asymmetric replication and transdifferentiation. Wallerian Degeneration Axonal degeneration can occur via several mechanisms, the most common being anterograde (or wallerian) and retrograde ("dying back") degeneration. Lipomas are generally solitary lesions that vary from tiny, barely perceptible fatty collections to huge bulky masses. In general, for histopathologic evaluation in all suspected cases of leprosy the following broad guidelines should be followed: cell type of granuloma; nerve involvement; and bacterial load. Calcification Hypertension Thrombosis Vasculitis Vasoconstriction Lymphedema Subclavian arterial thrombosis Thrombophlebitis Tumor embolization Vasculitis 44 A 50-year-old man cuts his right index finger on a sharp metal shard while cleaning debris out of the gate in an irrigation canal. Pulsation artifacts along the phase-encoding direction cause propagation of "ghosting" artifacts in a straight linear band across the entire imaged plane. Strong pulses are palpable in the upper extremities, but there are only weak pulses in the lower extremities. Microscopic appearance showing diagnostic neutrophilic infiltration into the muscularis. The toxic products formed by bacteria are absorbed causing profound systemic manifestations of septicaemia, and finally death. On physical examination, the child appears chronically ill, listless, and underdeveloped. Early lobectomy or hemispherectomy in infants with drug-resistant epilepsy and widespread hemispheric angioma may be an option in severe cases. Cell injury is defined as a variety of stresses a cell encounters as a result of changes in its internal and external environment. Generally, regional lymph nodes draining the tumour are invariably involved producing regional nodal metastasis. Marijuana is a minor tranquilizer; no serious physiologic effects are associated with its use. Classic heat stroke risk factors include high ambient temperature and humidity, dehydration, alcohol abuse, and some medications (antihypertensive or psychiatric). Most acute periictal abnormalities are reversible and normalize within a few days. These conditions are cigarette smoking, viral respiratory infections, immotile cilia syndrome, inhalation of hot or corrosive gases and old age. The most characteristic cell in secretions from an allergic response is the eosinophil. After this period, a nodule develops at the inoculation site which subsequently ulcerates and heals poorly as the guinea pig, unlike human beings, does not possess any natural resistance. Pathology A tangle of thin-walled vessels-multiple enlarged capillaries and venous channels-forms the characteristic leptomeningeal (pial) angioma. Besides, results in intracellular accumulation of sodium and diffusion there is also decreased replacement-synthesis of membrane of potassium out of cell. Patients with malignant neoplasms may have a hypercoagulable state (Trousseau syndrome) that favors the development of arterial and venous thromboses. Note that the thick, abnormal cortex curves over the "lips" of the clefts and follows them all the way medially to the ventricular ependyma. Transfusion of platelets is done in patients of thrombocytopenia who have haemorrhage.