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• W2019900004 abstract "Cerebral functional imaging methods provide complementary information on brain function and large vessels regulatory controls which are compromised in cranial base lesions. The presence of a skull base tumor can alter regional cerebral blood flow (rCBF) in adjacent and remote brain tissue. This report presents the results of 104 CBF studies in 66 patients with skull base lesions (aged 17–75 years). The lesions included 36 meningiomas, 21 neurinomas and 9 other tumors. Regional CBF in tumor and brain tissue was measured prior to treatment using stable xenon enhanced computed tomography (Xenon(/T). For the quantitative analysis, regions of interest were delineated on tumor regions, cerebral and cerebellar hemispheres including peritumoral regions. In order to assess the remote effects of cerebellopontine angle (CPA) tumors, the brainstem, cerebellar, and cerebral blood flow were measured in 26 cases. The average brainstem CBF for patients with good outcome was higher than the average brainstem CBF for patients with poor outcome. This indicates that CBF studies in posterior fossa can be useful in predicting the prognosis of CPA tumor patients. We report a series of 16 patients with cavernous sinus tumors in whom the internal carotid artery was affected by the tumor. In nearly all cases Xenon/CT CBF studies with acetazolamide test showed no significant difference in hemispheric perfusion and a sufficient cerebrovascular reserve capacity. Interhemispheric asymmetry was present only in one patient. These results possibly indicate that i.v. administration of acetazolamide might contribute in selecting patients with higher risk for ischemic deficits after cavernous sinus surgery. Skull base meningiomas showed very high blood flow with a wide range. Local CBF in the peripheral region of meningiomas was higher than in the central region. Blood flow values in the peritumoral areas are about 30% lower than those of the ipsilateral hemisphere. In individual cases, blood flow values in the peritumoral low-density areas on CT were extremely low. It is concluded that CBF studies in skull base tumors are valuable in treatment planning. Xenon/CT can be a useful additional diagnostic procedure in the evaluation of skull base surgery candidates." @default.
• W2019900004 created "2016-06-24" @default.
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• W2019900004 date "1996-07-01" @default.
• W2019900004 modified "2023-09-25" @default.
• W2019900004 title "Alteration of rCBF in skull base lesions" @default.
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• W2019900004 doi "https://doi.org/10.1111/j.1600-0404.1996.tb00588.x" @default.
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