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I.はじめに
Posterior circulation(後大脳動脈及び椎骨脳底動脈系)の末梢部に発生する脳動脈瘤は非常に稀であり,その治療に苦慮することが多い.われわれは最近7例のposterior circulationの末梢性脳動脈瘤を経験した.これらの経験をもとに,pos-terior circulationの末梢性脳動脈瘤に対する治療戦略について論ずる.
Peripherally located aneurysms of the posterior circulation are extremely rare. The outcome of patients with peripherally located aneurysms has been poor, and the treatment of such aneurysms has been surgi-cally challenging. We report a consecutive series of peripherally located ruptured aneurysms in the pos-terior circulation, and discuss in this article the optimal treatment strategy for such lesions. Clinical pre-sentation, neuroradiological findings, treatment method, and the outcome were reviewed retrospectively.Two cases with distal posterior cerebral artery aneurysm, two with distal posterior inferior cerebellar artery aneurysni, two with anterior inferior cerebellar aneurysm, and one with superior cerebellar artery aneurysm were included in this study (mean age, 59.3±16.0, M:F=1:6). Three patients with good neu-rological status on admission who underwent clipping of the aneurysmal neck via craniotomy showed a favorable outcome. In contrast, four patients with poor neurological status on admission who underwent endovascular proximal occlusion of the parent artery showed an unfavorable outcome. Although the out-come of patients who underwent endovascular surgery was poor, endovascular proximal occlusion was effective in preventing re-rupture of the aneurysms. Proximal occlusion of the parent artery has several shortcomings such as cerebral infarction, but proximal occlusion at the very distal area of the parent arte-ries would not be critical because of good collateral circulation. Thus, endovascular proximal occlusion may provide us another option in the treatment of peripherally located aneurysms especially in patients with poor neurological status. Further data is needed to discover the optimal treatment for patients with peripherally located cerebral aneurysms.
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