Medial proximal striate arteryの圧迫症状を呈した未破裂動脈瘤の1例

A Case of Unruptured A1 Aneurysm causing Ischemic Compression to the Medial Proximal Striate Artery

I．はじめに

　脳動脈瘤による脳虚血症状の発現機序として動脈瘤破裂後の脳血管攣縮によるものが最も多いが，動脈瘤内由来の血栓塞栓による例も報告されている．今回われわれは動脈瘤自体が近接する血管を圧迫し，その血管の血流障害により脳虚血症状を呈していたと思われる稀な症例を経験したので若干の文献的考察を加え報告する．

A 58-year-old female was admitted to our hospital because of weakness of the right lower extremity and dysesthesia of the right upper extremity. From her clinical symptoms the patient was tentatively diagnosed as having a sort of cerebral infarction and treated with administration of urokinase and antiplatelet agents. However, angiographical exami-nation revealed a unruptured aneurysm of the Al portion of the left anterior cerebral artery. Pre-operative angiogram showed that the dome of the aneurysm compressed one of the neighboring per-forating artery which arose from adjacent to the neck of the aneurysm.