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  • 1
    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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  • 2
    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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    Paper (German National Licenses)
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  • 3
    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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    Paper (German National Licenses)
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Pituitary choristoma composed of corticotrophs and adrenocortical cells in the sella turcica (1996)
    Springer
    Virchows Archiv 427 (1996), S. 613-617 
    Details
    ISSN: 1432-2307
    Keywords: Pituitary gland ; Choristoma ; Corticotroph ; Adrenocortical cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A pituitary tumour composed of well-differentiated corticotrophs and adrenocortical cells is reported. Sections of the tumour revealed a mixture of small round cells with amphophilic or basophilic periodic acid-Schiff (PAS)-positive cytoplasm and large spherical and oval cells with abundant, granular, partly vacuolated PAS-negative cytoplasm. The small cells contained type 1 cytokeratin-positive microfilaments, numerous 250–500 nm endocrine-type secretory granules immunoreactive for adenocorticotropic hormone (ACTH) and β-lipotropin. The large cells possessed ample cytoplasm filled with abundant vesicular smooth endoplasmic reticulum, numerous mitochondria possessing tubulovesicular cristae and frequent dense bodies. They lacked the features of pituitary endocrine cells or folliculostellate cells and were found to contain a panel of steroidogenic dehydrogenases and hydroxylases. The tumour was classified as a choristoma, in which two distinct cells types, corticotrophs and adrenocortical cells, were mixed. We suggest that, under continued ACTH stimulation, uncommitted stem cells may differentiate into adrenocortical cells. Alternatively, the presence of adrenocortical cells may be the result of heterotopia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202893
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental model of chronic tonsillar herniation associated with early stage syringomyelia (1995)
    Springer
    Acta neuropathologica 90 (1995), S. 425-431 
    Details
    ISSN: 1432-0533
    Keywords: Tonsillar herniation ; Syringomyelia ; Chiari malformations ; Histology ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This report describes an experimental model of chronic tonsillar herniation and its effects on the spinal cord. In ten rats, a small piece of chemically induced mammary cancer was transplanted to the supraoccipital bone. In all cases, the transplanted cancers grew into the posterior fossa, destroying the supraoccipital bone and compressing the cerebellum extradurally. In six of the ten rats, tonsillar herniation was observed at 8–14 weeks after transplantation. Transdural infiltration of the tumor cells was not apparent in any animal. In those rats with tonsillar herniation (n=6), the spinal cord from the C5 to the T8 segments showed enlargement of the central canal without exception. Histological examination revealed the following changes: stretching and thinning of the ependymal cells; swelling of the astrocytic processes; and extracellular edema, predominantly in the dorsal gray matter, but also in the ventral inner portion of the dorsal column. In the control group (n=4) and those rats without tonsillar herniation (n=4), such histological changes of the spinal cord were not observed. Although the lesions can not be regarded as representing mature syringomyelia, they most likely constitute an earlier evolutionary stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294801
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