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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 32 (1975), S. 103-113 
    ISSN: 1432-0533
    Keywords: Annulate Lamellae ; Fenestrae ; Germinoma ; Tubular Array ; Tubular Bodies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of an intracranial germinoma from the suprasellar region of a 9-year-old girl was examined in the electron microscope. The tumor consists, for the most part, of both large polygonal and small lymphocyte-like elements. Annulate lamellae are common in the epithelial cells. The small blood vessels are fenestrated, and the endothelial cells contain tubular bodies, membrane-bounded vacuoles containing dense fluid and occasional tubules, arrays of tubules within the nuclear envelope and rough endoplasmic reticulum, and a markedly irregular luminal surface. Dense, lamellated structures are present in the widened, collagen-containing perivascular spaces.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 32 (1975), S. 175-186 
    ISSN: 1432-0533
    Keywords: Fibroma ; Fibroblast ; Junctional Complex ; Blood Vessel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The fine structure of an intracerebellar “fibroma” has been examined. The tumor consists of irregularly-shaped cells connected by well developed junctional complexes. Unusual, fenestrated capillaries with extremely narrow and irregular lumens are frequent. Collagen fibers are not common but the wide extracellular spaces contain large amounts of dense, granular or fibrillar material. The dense material coats the tumor cells and is apparently secreted from small vesicles found within these cells.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 693 (1993), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-7373
    Keywords: cerebral aspergillosis ; acute leukemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cerebral fungal infection is becoming an increasingly recognized entity in immunocompromised patients on post-mortem examination. In order to determine the frequency of clinically significant cerebral fungal infection and define its clinical characteristics in a cohort of immunocompromised patients at high risk of fungal infection, the records of 118 patients with acute leukemia were examined for 57 clinical and laboratory features. The characteristics of 26 patients with systemic aspergillosis and acute leukemia were compared to 92 patients with acute leukemia in a control group. Eight of 118 patients (7%) had cerebral infection (seven Aspergillus, on Candida). Patients with systemic aspergillosis were more likely than patients in the control group to have focal neurologic findings (p = 0.02), confusion (p = 0.04), and abnormal computerized tomography (CT) of the brain characterized by single or multiple, enhancing or non-enhancing hypodense lesions (p = 0.02). Patients with systemic aspergillosis were more likely to die in complete remission than patients in the control group (p = 0.003); three of six patients with aspergillosis who died in remission expired as a consequence of cerebral infection. Cerebral infection complicated systemic Aspergillus infection in seven of 26 patients (27%), versus one of 16 patients with systemic Candida infection (6%) (p = NS). The authors conclude, therefore, that systemic aspergillosis complicating acute leukemia is more likely to be associated with confusion, focal neurologic findings, and and abnormal CT scan of the brain, and that these findings suggest the presence of cerebral infection. In addition, cerebral infection commonly complicates the course of systemic aspergillosis, and is a significant cause of morbidity and mortality in patients with acute leukemia. A high index of suspicion is needed to insure early diagnosis and appropriate therapy, particularly in those who achieve remission of their leukemia.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neuro-oncology 7 (1989), S. 339-344 
    ISSN: 1573-7373
    Keywords: cerebellar astrocytoma ; cerebellar glioblastoma ; longevity ; malignant transformation ; radiation-induced tumor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A 70-year-old woman is reported who had glioblastoma multiforme of the cerebellum 52 years after radiation therapy to a midline cerebellar tumor. Seven similar reported cases are reviewed. Dedifferentiation of astrocytoma to glioblastoma and the role of radiation therapy are discussed.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1861-387X
    Keywords: Craniopharyngioma ; Stroma ; Brain invasion ; Rosenthal fiber
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The numerous pathology reports on craniopharyngioma describe the classical features of squamous epithelium and keratin. Relatively little attention has been paid to its stroma and the surrounding tissue. We focused our observation on these two areas in a retrospective study of craniopharyngiomas in 36 operative cases and 5 autopsy cases. The tumor interdigitated with the brain and pituitary gland. At the interface, the brain was markedly gliotic with Rosenthal fibers simulating pilocytic astrocytoma. The tumor stroma had reactive changes and commonly showed cyst formation and calcification.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Microscopy Research and Technique 27 (1994), S. 543-556 
    ISSN: 1059-910X
    Keywords: Endothelial cells ; Perivascular astrocytes ; Brain edema ; Blood-brain barrier ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: The anatomical site of the blood-brain barrier (BBB) is at the capillary endothelium mainly, with some contribution from astrocytes. Electron microscopic observations of endothelial cells and perivascular astrocytes comprising the BBB in brain edema and other pathological conditions are reviewed in this article. The tight junctions of cerebral endothelial cells open under several conditions such as infusion of hyperosmolar solutions. Pinocytotic vesicles increase under various pathological conditions and fenestrae appear in blood vessels of certain brain tumors and several non-neoplastic lesions. Inflammatory cells penetrate between or through endothelial cells. In long standing lesions, endothelial cells containing various tubular structures such as Weibel-Palade bodies proliferate. Other alterations include surface infoldings of endothelial cells and fluid diffusion through damaged endothelium. Astrocytic alterations include abnormal junctions between astrocytic processes in certain gliomas. In vivo and in vitro studies suggest that astrocytes maintain or develop certain functions of BBB. As the BBB is disrupted, edema fluid infiltrates the brain parenchyma. Because the white matter consists of nerve fibers without demonstrable junctions, it invades between nerve fibers. In the gray matter, expansion of the fluid is limited by complicated anatomical structures. In myelinated nerve fibers, edema fluid accumulates in five separate compartments of extracellular space. © 1994 Wiley-Liss, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Brain tumor pathology 14 (1997), S. 113-117 
    ISSN: 1861-387X
    Keywords: Meningioma ; Intraspinal ; Immunohistochemistry ; Epithelial differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To investigate the epithelial features of intraspinal meningiomas, 25 intraspinal meningiomas and 25 intracranial meningiomas were examined for the presence of pseudopsammoma bodies with hematoxylin-eosin and periodic acid-Schiff staining. In addition, we investigated the expression of keratin and epithelial membrane antigen (EMA) by immunohistochemical methods. Pseudopsammoma bodies were found in 3 of 25 cases of intracranial meningiomas (12%), but no definitive pseudopsammoma bodies were observed the intraspinal mengiomas. Three cases (12%) of intraspinal meningiomas and 9 cases (36%) of intracranial meningiomas, including 3 cases with pseudopsammoma bodies, were immunoreactive for keratin. All 25 (100%) intracranial meningiomas and 20 of 25 (84%) intraspinal meningiomas were reactive for EMA. In the intraspinal meningiomas, 4 of 25 cases (16%) showed no reactivity for EMA. These findings suggest that the origin of certain cell components of meningiomas may be different according to the site of the tumor or that the nature of meningioma may be modified by the local environment.
    Type of Medium: Electronic Resource
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