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  • 1
    Electronic Resource
    Electronic Resource
    High Resolution Electron Microscopic Observation of Fission Tracks in Zircon (1989)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 5 (Jan. 1989), p. 143-152 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/25/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.5.143.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Oligodendroglioma-like cells (clear cells) in ependymoma (1983)
    Springer
    Acta neuropathologica 62 (1983), S. 141-144 
    Details
    ISSN: 1432-0533
    Keywords: Ependymoma ; Clear cells ; Oligodendroglioma-like cells ; Mixed glioma ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A brain tumor of a 22-year-old man was composed mostly of round cells with perinuclear halos (clear cells), forming clusters intersected by small blood vessels. In some areas, the tumor cells showed perivascular arrangement and epithelial pattern. Phosphotungstic-acid hematoxylin stain and immunoper-oxidase stain for glial fibrillary acidic protein (GFAP) technique failed to stain the clear cells. Electron microscopy of the clear cells revealed them to be classical ependymoma cells with well developed intercellular junctions, microvilli and cilia. As no reporters in the past showed the evidence to clarify the nature of the clear cells, this case is considered a good example to support the viewpoint that the clear cells (oligodendroglioma-like cells) commonly observed in ependymomas are in reality ependymoma cells. It is stressed that the diagnosis of “mixed glioma” or “oligoependymoma” should be made with sufficient caution despite the recent advances of GFAP technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00684931
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  • 3
    Electronic Resource
    Electronic Resource
    Meningiomas differentiating to arachnoid trabecular cells: a proposal for histological subtype “arachnoid trabecular cell meningioma” (1991)
    Springer
    Acta neuropathologica 82 (1991), S. 327-330 
    Details
    ISSN: 1432-0533
    Keywords: Meningioma ; Microcystic meningioma ; Vacuolated meningioma ; Arachnoid trabecular cell ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Three cases of meningiomas which had abundant small vacuoles in the tumor tissue are reported. By electron microscopy, the tumor cells exhibited long and thin processes, the tips of which were united by desmosomes. The tumor tissue was revealed to have wide extracellular spaces which corresponded to the vacuoles observed by light microscopy. In previous literature, various terms have been used when referring to this meningioma, such as microcystic meningioma or vacuolated meningioma. Since the ultrastructure of the tumor showed similarity to that of normal arachnoid trabecular cells, we propose to call the tumor “arachnoid trabecular cell meningioma” denoting its morphological nature clearly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296542
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  • 4
    Electronic Resource
    Electronic Resource
    Anomaly of venous system in congenital occipital dermal sinus (1994)
    Springer
    Acta neurochirurgica 128 (1994), S. 174-179 
    Details
    ISSN: 0942-0940
    Keywords: Congenital occipital dermal sinus ; dural sinuses ; development ; embryology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We report two cases of congenital occipital dermal sinus in which elongation of the vein of Galen, elevation of the straight sinus, division of the superior sagittal sinus, elevation of the confluence of sinuses, elevation of transverse sinus and narrowing of the torcular angle were observed in the venous phase of cerebral angiography. Enhanced computed tomography (CT) revealed enlargement of the supracerebellar cistern, elevation of the straight sinus and of the confluence of sinuses, but no evidence of intracranial lesions. In order to study the relationship between anomalies in the dural venous sinuses and congenital occipital dermal sinus, we examined both cases from an embryological viewpoint.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01400671
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  • 5
    Electronic Resource
    Electronic Resource
    Stump pressure as a guide to the safety of permanent occlusion of the internal carotid artery (1996)
    Springer
    Acta neurochirurgica 138 (1996), S. 549-554 
    Details
    ISSN: 0942-0940
    Keywords: Balloon test occlusion ; stump pressure ; back pressure ; 99 mTc-HMPAO SPECT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Does the absolute value of the stump pressure (post-occlusion back pressure) become a useful index of a good collateral circulation? The authors continuously monitored the mean arterial pressure before, during and after 20-minute balloon test occlusion in 24 patients. The stump pressure was then compared with the results of99 mTc-hexa-methyl propyleneamine (99 mTc-HMPAO) single photon emission computed tomography (SPECT) performed after 20 minutes of test occlusion. Patients who failed to tolerate even brief periods of carotid occlusion and showed asymmetric decreases in cerebral blood flow (CBF) on SPECT were divided into high and moderate risk groups. Those with no significant change in CBF on the occluded side formed the minimum risk group. Mean stump pressure was over 50 mmHg in three of a total of 13 patients in the high and moderate risk groups, and below 50 mmHg in two of the 11 patients in the minimum risk group. The ratios of the initial mean stump pressure to the pre-occlusion mean arterial pressure (%) and of the final mean stump pressure at the end of occlusion to the post-opening mean arterial pressure (%) did not exceed 58% in any patient in the high and moderate risk groups, and were at least 60% in all patients of the minimum risk group. Maintenance of a mean stump pressure of 60% or more of the mean systemic pressure during test occlusion may be a more useful index of a good collateral circulation than the absolute value of mean stump pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411175
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  • 6
    Electronic Resource
    Electronic Resource
    Dural chondroma with fat tissue (1997)
    Springer
    Acta neurochirurgica 139 (1997), S. 690-691 
    Details
    ISSN: 0942-0940
    Keywords: Chondroma ; dura mater ; teratoma ; fat tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412006
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  • 7
    Electronic Resource
    Electronic Resource
    Syringomyelia with basilar impression in osteogenesis imperfecta (1996)
    Springer
    Acta neurochirurgica 138 (1996), S. 888-889 
    Details
    ISSN: 0942-0940
    Keywords: Osteogenesis imperfecta ; basilar impression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411270
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  • 8
    Electronic Resource
    Electronic Resource
    A source of haemorrhage in adult patients with moyamoya disease: The significance of tributaries from the choroidal artery (1996)
    Springer
    Acta neurochirurgica 138 (1996), S. 1282-1286 
    Details
    ISSN: 0942-0940
    Keywords: Moyamoya disease ; intraventricular haemorrhage ; angiography ; choroidal artery ; medullary artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This study concerns 19 patients over 16 years of age with Moyamoya disease. Ten cases of intracranial haemorrhage, as the initial haemorrhagic event in patients aged from 21 to 55 (haemorrhagic group) and 9 cases of ischaemic events in 18- to 53-year-old patients (ischaemic group) were included. All haemorrhages were associated with intraventricular haemorrhages (IVH); and all but one case of thalamic haemorrhage were thought to be primary IVH (2 cases of small paraventricular haemorrhage; 2 of small haemorrhages in the splenium; 5 with no intracerebral haematoma). In the 9 patients of the ischaemic group, there were 2 cases of transient ischaemic attacks and 7 of cerebral infarction. Angiographic evaluations demonstrated that the abnormal basal vessel formation and the collateral supplies from the external carotid arteries were poorly developed in both groups. In contrast, the collateral circulation via the choroidal and posterior pericallosal arteries was well demonstrated. Furthermore, marked enlargement of the choroidal arteries and the medullary arteries derived from them was seen more frequently in the haemorrhagic group. These findings suggested that the haemodynamic load in the vessels supplying the walls of the posterior parts of the ventricles and the periventricular region was increased, especially in the haemorrhagic group. Those vessels were considered to be important sites of IVH in adult patients with Moyamoya disase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411056
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of hyperdynamic therapy on cerebral ischaemia caused by vasospasm associated with subarachnoid haemorrhage (1982)
    Springer
    Acta neurochirurgica 63 (1982), S. 291-296 
    Details
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Ten patients who developed neurological deficits associated with angiographically proven cerebral vasospasm caused by ruptured aneurysm were treated with hyperdynamic therapy induced by administration of a large amount of human serum albumin. No vaso-active drugs were administered. Cardiopulmonary function and intracranial pressure were monitored during the treatment. Marked improvement of neurological function was observed in all cases. Nine patients recovered completely without any neurological residual following treatment. The degree of the improvement observed during treatment closely correlated with the decrease in total peripheral resistance. Infusion of albumin did not cause elevation of intracranial pressure. It was concluded that the hyperdynamic therapy induced by administration of albumin has a dramatic effect on the ischaemic cerebral insult caused by vasospasm. It is postulated that the main effect of this treatment is produced by cerebrovascular dilatation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01728884
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  • 10
    Electronic Resource
    Electronic Resource
    Study of chrysotile asbestos by a high resolution electron microscope (1967)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 23 (1967), S. 704-707 
    Details
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0365110X67003524
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