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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 29 (1974), S. 251-262 
    ISSN: 1432-0533
    Keywords: Polymyositis ; Ultrastructure ; Histiocytes ; Birbeck Granules ; Macrophages
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A fatal case of polymyositis in a young female is presented. Two muscle biopsies obtained before and after treatment with large doses of steroids, as well as autopsy tissue, demonstrated widespread degeneration of myofibres associated with cytoplasmic tuboreticular structures resembling paramyxovirus nucleocapsids in capillary endothelial cells and fibroblasts. Aggregates of spherical particles and “simple and granular” nuclear bodies suggested a virus-related or associated etiologic agent. In addition, interstitial cells of mesenchymal origin, probably related to macrophages or histiocytes were present. These contained numerous rodlike profiles or phagolysosomal bodies which resembled “Birbeck” granules. Inflammatory response was very scant. It would appear that polymyositis probably represents a primary reaction to antigemic substances and a morphologic manifestation of altered host macrophage response.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 33 (1975), S. 173-177 
    ISSN: 1432-0533
    Keywords: Mesothelioma ; Pleura ; Metastases ; Brain ; Ultrastructure ; Asbestos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A malignant fibrous mesothelioma in a 52 year old white man arising from the left parietal pleura associated with lupus erythematosus with metastases to brain and liver is reported. Asbestos bodies were found in digested pulmonary tissue but none in the primary or metastatic lesions. Light microscopic and ultrastructural studies suggest that this tumor contains mesothelial or endothelial cells, some of which revealed fibroblastic features while others disclosed epitheloid characteristics.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0533
    Keywords: Free-living amebas ; Encephalitis ; Granuloma ; Acanthamoeba ; Naegleria ; “Mycotic aneurysm”
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Primary amebic meningoencephalitis and granulomatous amebic encephalitis are well recognized clinicopathological entities caused by free-living amebas. Associated arteritis and “mycotic aneurysms” with infiltration of intracranial arteries by lymphocytes, amebic trophozoites and cysts have not been previously reported. A 26-month-old girl had a 3-week history of encephalitis, characterized, initially, by vomiting and lowgrade fever. Subsequently, she developed ataxia, generalized weakness, lethargy, and esotropia. The first CSF showed 490 RBC/μl, 705 WBC/μl with 90% mononuclears. Her pupils reacted briskly to light. Moderate nuchal rigidity, nystagmus, fixed downward gaze, anisocoria, bilateral 6th nerve palsy, left arm monoparesis and left Babinski were present. CAT scan revealed slight symmetrical dilatation of anterior horns of lateral ventricles and an area of abnormal enhancement above the 3rd ventricle. She died 14 days after admission, 5 weeks after onset of symptoms. The brain showed focal necrotizing encephalopathy, involving thalami, cerebellum, brain stem, and cervical and upper thoracic spinal cord. Numerous free-living amebic trophozoites and cysts were present within a chronic granulomatous encephalitis. There were thrombosis of basilar, posterior cerebral, and vertebral arteries with profuse chronic panarteritis, fibrinoid necrosis, and mycotic aneurysms.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0533
    Keywords: Subacute Sclerosing Panencephalitis ; Intranuclear Inclusions ; Intracytoplasmic ; Intraaxonal Inclusions ; Nuclear Bodies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A description of “nuclear bodies”, “intranuclear crystalloid tubules” and intracytoplasmic inclusions from eight SSPE cases in clinical stage 2 and 3 is presented. The development and evolution of nuclear bodies is proposed. No correlation between the clinical stage of the disease and the different morphological aspects of nuclear bodies was found. The presence of nuclear bodies in SSPE is a consistent feature and consequently these “structures” should have a definite diagnostic value in clinically suspected cases of SSPE. All the cases showed various types of intranuclear inclusions ranging from “simple” nuclear bodies to granular “beaded” nuclear bodies and paramyxovirus nucleocapsids. Intralysosomal nucleocapsids were found in one case. In one instance intraaxonal paramyxovirus nucleocapsids were found. Intranuclear elongated tubules and/or filamentous paracrystalline bundles, some arranged in lattice-like fashion were also found. No apparent morphological relationship was demonstrated between these structures and the “simple” nuclear bodies, granular “beaded” nuclear bodies and “nucleocapsids.” From these observations, we propose that “simple” nuclear bodies evolve into paramyxovirus nucleocapsids tubules and that there is a migration of virus or virus-related structures from nuclei to cytoplasm and then to axoplasm.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0533
    Keywords: Progressive Multifocal Leukoencephalopathy ; Hirano Bodies ; Papova Virus ; Paramyxovirus-like ; Nuclear Bodies ; Electron Microscopy ; Neurofibrillary Tangles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We have identified three structures that have not previously been reported in electron microscopic examinations of brain from patients with PML: 1. coiled nuclear bodies that may possibly represent tubular paramyxovirus nucleocapsids, 2. Hirano bodies and 3. Neurofibrillary tangles. The paramyxovirus-like material is interesting in view of reports of a transition between nuclear bodies and tubular paramyxovirus nucleocapsids and because of a possible interaction between syncytiogenic paramyxoviruses and Papova viruses in the pathogenesis of SSPE and PML. A study of the Hirano bodies in this case, taken in conjunction with the findings of others leads us to believe that these structures are formed from an overgrowth of neurofilaments. The presence of tangled masses of neurofilaments in the processes of neurons also seen in the present case is consistent with this hypothesis.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0533
    Keywords: Acanthamoeba ; Naegleria ; Meningoencephalitis ; Granulomatous ; Free-living amebas ; Cysts ; Trophozoites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Amebic Meningoencephalitis (AM) and Primary Amebic Meningoencephalitis (PAM) are infectious diseases essentially confined to the Central Nervous System (CNS) and caused by free-living amebas of the genusAcanthamoeba (A.) andNaegleria (N.) respectively. AM due toA. sp. (Acanthamoeba castellanii andAcanthamoeba culbertsoni) have been reported in chronically ill debilitated individuals, some of them under immunosuppressive therapy, or in immunologically impaired patients without a history of recent swimming in contrast to cases due toN.sp. which usually occurs in healthy, young individuals with a recent history of swimming in man-made lakes or heated swimming pools. AM due toA.sp. is characterized by a subacute or chronic granulomatous meningoencephalitis involving mainly the midbrain, basal areas of the temporal and occipital lobes and posterior fossa structures. CNS lesions in AM are perhaps secondary and the portal of entry in humans is probably from the lower respiratory tract, genitourinary system or skin reaching the CNS by hematogenous spread. The predominant host reaction is usually composed of lymphocytes, plasma cells, monocytes and multinucleated foreign body giant cells. Necrosis is moderate and hemorrhage scant or absent. Cysts as well as trophozoites may be seen within the CNS lesions. PAM is due toNaegleria fowleri and is characterized by an hemorrhagic necrotizing meningoencephalities with an acute inflammatory response. Only trophozoites are found in lesions. The portal of entry is through the olfactory neuroepithelium. CNS tissues fixed in formalin may be used for further identification and taxonomical classification of the causative protoza using immunofluorescent antibody techniques (IFAT) and electron microscopic methods.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0533
    Keywords: Acanthamoeba ; Amebic encephalitis ; Corticosteroids ; Free-living amebas ; Immunosuppression ; Intracranial mass ; Naegleria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Clinical and brain biopsy or autopsy findings in six patients with Granulomatous Amebic Encephalitis (GAE) due toAcanthamoeba sp. were characterized by focal neurological symptoms, increased intracranial pressure, and focal neuroradiological findings. Craniotomies were performed because of the diagnostic possibility of a mass lesion such as a brain tumor or abscess. In four patients, frozen sections demonstrated free-living amebas. GAE may present as an acute or subacute intracerebral mass lesion with signs and symptoms of focal brain disease and should be differentiated from viral, bacterial, fungal, and other protozoal encephalitides.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 28 (1974), S. 93-103 
    ISSN: 1432-0533
    Keywords: Hexachlorophene Intoxication ; Toxic Encephalopathy ; Optic Nerve Necrosis ; Cerebral Edema ; Status Spongiosus ; Electron Microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This is the first report of neuropathologic findings following oral ingestion of hexachlorophene in the human. The patient was a 7 year old boy who accidentally ingested 45 ml (approx.) of pHisoHex (hexachlorophene).Toxic reactions included nausea, vomiting, anorexia, diarrhea, decrease in visual acuity, blurred vision blindness, somnolence and disorientation. He developed cardiac arrhythmia, fever, isoelectric EEG and finally respiratory and cardiac arrest 61 h after admission. Autopsy findings showed interstitial myocarditis, pneumonitis and acute bronchiolitis. The brain was edematous. Light microscopy revealed mild diffuse vacuolization of white matter, occasional neuronal degeneration, most prominent on deepest layers of the visual cortex. Disintegration of myelin sheaths and necrosis of axon cylinders were present throughoutoptic pathways. Electron microscopy revealed large, empty extracellular and intramyelinic spaces formed by splitting and separation of the myelin lamellae. These changes are known to occur in experimental animals intoxicated with hexachlorophene, triethyltin, isonicotinic acid hydrazide and cuprizone. However, with respect to hexachlorophene, the localization of lesions to be optic pathways appears to be dependent upon an oral route of administration.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0533
    Keywords: Aseptic Meningitis ; Atheromatous Material ; Hypersensitivity ; Electron Microscopy ; Macrophages ; Pia-Arachnoid ; Granuloma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 500 mg of sterile pooled human atheromatous material was injected into the cisterna magna of 6 mongrel dogs. Repeated cisternal punctures were done at various intervals until sacrifice from 1 day to 28 days following injection. CSF was obtained for cell count, sugar, protein and analysis in the Technicon 6/60 which measured 14 additional chemical and enzymatic variables. All 6 animals showed a prompt cerebrospinal fluid (CSF) pleocytosis which largely subsided during the first 2 weeks after injection. Increased CSF protein content developed more slowly, but was more prolonged than the pleocytosis. There was a variable decrease in CSF sugar and increase in CSF lactate dehydrogenase, calcium and inorganic phosphorous. Light and electron microscopic studies showed an intense acute inflammatory reaction with marked phagocytosis of the foregin material, probably by arachnoidal cells and moderate edematous changes in the astrocytic processes at the site of injection. During the first 2 weeks after the injection the inflammatory reaction became chronic and the edematous changes in the medulla subsided.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 34 (1976), S. 237-253 
    ISSN: 1432-0533
    Keywords: Strabismus ; Extraocular muscles ; Hirano bodies ; Ultrastructure ; Luse bodies ; Leptomeres
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thirty extraocular muscles (EOM) from 20 patients were evaluated by light microscopy (LM), electron microscopy (EM), and enzyme histochemistry (EZH). Twenty-one EOM were obtained from 13 patients with strabismus, 9 EOM from 4 patients undergoing eye surgery for other reasons and from 3 autopsy cases. One μm thick sections revealed marked variation in muscle fibre shape and size and in myofibrillar structure; also noted were small, hypertrophied, whorled, and ringbinden fibres. Dense and granular material in the central portion of some fibres and sarcomere disruption in 2–3 μm sections was observed. EZH revealed the absence of the classical mosaic pattern usually found in skeletal muscles. ATPase studies were inconsistent and did not correlate with the expected reciprocal activity of NAD-H diaphorase, particularly on the large fibres. Ultrastructural features consisted of vacuoles within myofilament bundles, “smearing” of Z bands, and “nemaline rods”. Occasional myelin figures and lipid-like droplets were observed in subsarcolemmal spaces, associated with scattered clusters of glycogen granules. Abnormal mitochondria and subsarcolemmal inclusions of dense and granular material were conspicuous. “Leptomeric” profiles, “Zebra bodies”, or “striated bodies” were noted in 8 EOM's, and an Hirano body was found in 1. The intramuscular nerves contained structures resembling “Luse bodies” in 7 cases. These observations suggest that EOM from individuals with and without strabismus possess unique structural characteristics suggestive of developmental and morphological disarrangement of contractile elements. Some of these changes might play a role in the pathogenesis of strabismus and in the development of clinical symptoms. These features are significantly different from striated skeletal muscle. Therefore the criteria used in the pathological evaluation and diagnosis of skeletal muscle disorders cannot be unequivocally applied to EOM investigations. These data establish the necessity to determine histological norms, ultrastructural patterns, and develop new enzyme histochemistry criteria for the evaluation of EOM. Only then can an acceptable comparison of EOM and skeletal muscle be made.
    Type of Medium: Electronic Resource
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