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  • 1
    Electronic Resource
    Electronic Resource
    Solitary plasmacytomas of the occipital bone: a report of two cases (1997)
    Springer
    European radiology 7 (1997), S. 503-506 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Skull ; Occipital bone ; Plasmacytoma ; CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The radiological appearances of two cases of solitary plasmacytoma in the occipital bone are described. One arose in the lateral part and the other in the squama. They showed characteristic radiological features on CT, MRI and angiography. Bone scintigraphy and gallium scintigraphy were also available. Solitary plasmacytoma of the skull is a rare condition and usually occurs in the calvarium. The skull base is an extremely rare site and only four cases have been reported. The literature of solitary plasmacytoma of the skull is reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050192
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  • 2
    Electronic Resource
    Electronic Resource
    Haemodynamic Evaluation of Cerebral Gliomas Using XeCT (1998)
    Springer
    Acta neurochirurgica 140 (1998), S. 223-234 
    Details
    ISSN: 0942-0940
    Keywords: Keywords: Cerebral blood flow; XeCT; low grade glioma; high grade glioma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of this study was to characterize regional blood flow (BF) in untreated cerebral gliomas (CG) using stable Xe-enhanced computed tomography (XeCT). XeCT of 38 patients with untreated CG were analyzed and compared with CT and magnetic resonance images (MRI) and histopathological findings. Individual averaged BF values for tumour in 29 high grade gliomas (HGGs) and 9 low grade gliomas (LGGs) were intermediate between averaged BF values for cortex and white matter in the non-tumour bearing hemisphere. All averaged BF values for cyst and central necrosis were very low. In 27 HGGs, BF in tumour was relatively high in ring-enhancement lesions on CT and MRI, but was low even in viable tumour centers showing no contrast enhancement. In the other 2 HGGs, BF was low in tumour center and relatively high in tumour periphery regardless of homogeneous enhancement. In 5 HGGs, averaged BF value of the cortex outside surrounding oedema was higher than that of cortex in the non-tumour bearing hemisphere. In LGGs, BF distribution in tumour was homogeneously low in 3 small-sized and heterogeneous in 6 large-sized lesions including moderately high and low BF regions. These differences in BF pattern between HGGs and LGGs on XeCT might be helpful in considering to some extent the histopathology of untreated cerebral glioma pre-operatively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007010050089
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  • 3
    Electronic Resource
    Electronic Resource
    Cystic acoustic neurinomas: Studies of 14 cases (1996)
    Springer
    Acta neurochirurgica 138 (1996), S. 695-699 
    Details
    ISSN: 0942-0940
    Keywords: Acoustic neurinoma ; computerized tomography ; cystic tumour ; magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cystic acoustic neurinomas (ANs) are less frequent and are different from solid ANs in clinical and radiological features. We had 14 cystic ANs (13.5% of 104 cases) in the last 17 years. Computerized tomographic or magnetic resonance images allowed for the classification of these cystic ANs into three types: Type A being large single cysts with a thin tumourous wall (7 cases); type B single cysts with a thick tumourous wall (3 cases); type C multicystic (4 cases). Half of the cystic ANs were not accompanied by enlargement of the internal auditory canal, despite the largeness of the cysts. The mean size of the tumours was 29 mm in diameter. Type A cysts had a shorter clinical history than types B and C. One patient had intact hearing. In five cases, an atypical initial symptom such as facial pain, dysgeusia, facial palsy, unsteadiness or vertigo presented. The trigeminal nerve was involved in 12 cases, the facial nerve in nine. The characteristic features of cystic ANs are largeness of the tumour, a short clinical history, an atypical initial symptom, facial nerve involvement, and/or no enlargement of the internal auditory canal. In addition, the histological features are a lobular growth pattern, high nuclear atypia, and numerous macro phages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411474
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  • 4
    Electronic Resource
    Electronic Resource
    The Factors Influencing Haematoma Volume due to Arteriovenous Malformations (1999)
    Springer
    Acta neurochirurgica 141 (1999), S. 385-388 
    Details
    ISSN: 0942-0940
    Keywords: Keywords: Arteriovenous malformation; cerebral haemorrhage; haematoma volume; angiography; computed tomography.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary  Haemorrhage due to cerebral arteriovenous malformations (AVMs) varies from massive, requiring urgent operations, to clinically silent. The present study was designated to identify factors influencing haematoma size, and the pathophysiological mechanisms of massive haemorrhage were studied. 55 patients with intracerebral haematomas due to supratentorial AVMs were included in this study. Angiographic and clinical findings were retrospectively evaluated in relation to haematoma size.  Statistical analysis demonstrated that small size and the presence of only one draining vein were high risk factors for massive haemorrhage. The haematoma volume in small AVMs (30±4 cm3) was significantly larger than in other AVMs (7±3 cm3) (p=0.0005). AVMs with only one draining vein were associated with massive haematoma volume as compared to AVMs with two or more draining veins (30±4 versus 11±3 cm3, p=0.0023).  Our previous study demonstrated that feeding artery pressure (FAP) was significantly higher in AVMs with haemorrhage than in those without, as was draining vein pressure (DVP), and FAP and DVP were inversely related to the number of draining veins and the size of the AVMs. Thus, in small AVMs and AVMs with only one draining vein, local increase in DVP may thus contribute to massive haemorrhage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007010050314
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  • 5
    Electronic Resource
    Electronic Resource
    Frequent TIA in the territory fed by the anastomosed STA after combined therapeutic ICA occlusion and extracranial-intracranial bypass: Case report (1995)
    Springer
    Acta neurochirurgica 133 (1995), S. 206-210 
    Details
    ISSN: 0942-0940
    Keywords: Giant cerebral aneurysm ; carotid artery occlusion ; extracranial-intracranial bypass ; cerebral embolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Frequent transient ischaemic attacks (TIAs) in the territory fed by the anastomosed superficial temporal artery (STA) after combined therapeutic internal carotid artery (ICA) occlusion and extra-cranial-intracranial bypass is described in a 52-year-old woman with a giant aneurysm in the supraclinoid portion of the left ICA showing impairment of visual acuity in the left eye and right upper quadrantanopia. After the balloon test occlusion of the left ICA which was tolerated, the left STA-middle cerebral artery anastomosis was performed and occlusion of the left ICA using detachable balloons was carried out a day later. TIAs corresponding to the territory fed by the anastomosed STA occurred nine times two to four days and five times eight to nine days after the ICA occlusion without new infarction on computed tomography (CT) scan. Single-photon emission computed tomography showed no hypoperfusion immediately after the initial TIA. CT scan revealed thrombosis of half of the aneurysm a day after the ICA occlusion. The patient developed the same TIA as previously by compression of the left anastomosed STA at the time of follow-up angiography which was carried out eight days after the occlusion. Although heparin was continuously administered after the ICA occlusion for two days, the initial TIA occurred during heparinization. Anticoagulation seemed to be inadequate judging from activated coagulation time and incomplete thrombosis of the aneurysm occurred during heparinization. It is likely that the TIAs are caused by embolism via the STA, which is a rare ischaemic complication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01420076
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  • 6
    Electronic Resource
    Electronic Resource
    Long-term follow-up of the residual intracanalicular tumours after subtotal removal of acoustic neurinomas (1996)
    Springer
    Acta neurochirurgica 138 (1996), S. 206-209 
    Details
    ISSN: 0942-0940
    Keywords: Acoustic neurinoma ; intracanalicular tumour ; magnetic resonance imaging ; subtotal removal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We examined growth potential of residual intracanalicular tumours left from subtotal removal of large acoustic neurinomas. Eleven patients were followed-up by magnetic resonance (MR) imaging. The interval between surgery and MR study ranged from 12 to 29 years (median, 16 years). MR images of two patients showed no evidence of tumour remnant, and in six a small tumour was localized in the internal auditory canal. The other three showed an intracanalicular tumour protruding slightly towards the intracranial portion. This result suggests that the intracanalicular residual tumours have less risk of regrowth after subtotal removal of acoustic neurinomas. It is advisable to choose intracapsular subtotal removal without opening the internal auditory canal in the treatment of acoustic neurinoma, if it is large in size and there is a high risk of nerve injury.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411362
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  • 7
    Electronic Resource
    Electronic Resource
    Psammomatous Meningioma Arising from the Diaphragma Sellae (1998)
    Springer
    Acta neurochirurgica 140 (1998), S. 291-292 
    Details
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007010050099
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  • 8
    Electronic Resource
    Electronic Resource
    Surgical experience with massive lobar haemorrhage caused by cerebral amyloid angiopathy (1995)
    Springer
    Acta neurochirurgica 132 (1995), S. 48-52 
    Details
    ISSN: 0942-0940
    Keywords: Intracerebral haemorrhage ; spontaneous cerebral haemorrhage ; amyloid angiopathy ; surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Nineteen patients with massive lobar haemorrhage without angiographic lesions received direct or stereotactic surgery, and biopsy specimens were examined histologically. Ten patients (53%) were found to have vessels positive for Congo-red staining, and demonstrating amyloid angiopathy. In the patients with amyloid angiopathy, CT scan and surgical findings were investigated. Subarachnoid haemorrhage (9/10), irregularly shaped haematoma (9/10) and fluid-blood density level in the haematoma cavity (7/10) were frequently found on CT scan. The characteristic surgical findings in patients treated by direct surgery were subarachnoid haemorrhage adjacent to intracerebral haematoma (8/8) and the existence of a tangle of vessels in the haematoma cavity (4/8). Evacuation of haematomas was relatively easy, and difficulty of haemostasis was not encountered during surgery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01404847
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Proliferative Potential of Recurrent Intracranial Meningiomas as Evaluated by Labelling Indices of BUdR and Ki-67, and Tumour Doubling Time (1998)
    Springer
    Acta neurochirurgica 140 (1998), S. 26-32 
    Details
    ISSN: 0942-0940
    Keywords: Keywords: Recurrent meningioma; bromodeoxyuridine; Ki-67; tumour doubling time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This study was designed to provide the reciprocal relationship among labelling indices of 5-bromodeoxyuridine (BUdR LI), Ki-67 (Ki-LI), and tumour doubling time (Td) of recurrent meningiomas. In our series of 182 primary intracranial meningiomas, 46 cases recurred. The average of BUdR LI and Ki LI for nonrecurrent meningiomas were 0.77±0.13% and 4.71±1.96%, respectively. Recurrent meningiomas had significantly higher LIs at the first operation: BUdR LI was 3.77±1.22% and Ki LI was 14.78±3.17%. The recurrent ratio significantly increased with the degrees of each LI. And the linear regression analysis has demonstrated a significant correlation between BUdR and Ki LI. Td was calculated accurately by NIH, a computer software. Td showed a significant inverse correlation with each of the labelling indices. Consequently, BUdR, Ki LIs and Td of individual tumours correlate mutually well. Of the 46 recurrent cases, 4 received radiation after the operation. Td of the irradiated meningiomas tended to be longer than expected for their higher level of BUdR and Ki LIs before radiation therapy. Thus, it was shown that the radiation therapy delays the regrowth of meningiomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007010050053
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