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I.はじめに
椎骨脳底動脈系に生ずる動脈瘤は全頭蓋内動脈瘤の約15%5)といわれ,多くが脳底動脈分岐部,次いで後下小脳動脈起始部1)に好発する.なかでも後下小脳動脈末梢部に生ずるものは稀である.われわれは後下小脳動脈末梢部動脈瘤の4例を経験したが,そのうちの巨大動脈瘤の3例につき臨床上の特徴と放射線学的所見を述べ,文献的考察を加え報告する.
Posterior inferior cerebellar artery (PICA) aneu-rysms constitute approximately 3-6% of all intra-cranial aneurysms. Especially, aneurysms which originate from distal portion of PICA are very rare.
We experienced 4 cases of distal PICA aneurysma, 3 cases of which were giant sized. The clinical and radiological features of cases of a giant aneurysm ofdistal PICA are analyzed in this study.
They consisted of 2 male and 1 female, ranging in age from 37 to 66. They had suffered from headache, disturbances of cranial nerves, cerebellar disorders and dementia, caused by subarachnoid hemorrhage and mass effects of aneurysms.
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