Ruptured frontopolar artery aneurysmの2例

Ruptured Frontopolar Artery Aneurysm:Two Cases

Ⅰ．はじめに

　末梢性前大脳動脈瘤（distal anterior cerebral ar-tery aneurysm：以下DACAn）は全脳動脈瘤の5％前後^7）とされ比較的稀なものであるが，いわゆる前大脳動脈膝部（AC genu）以外の部位のものは細菌性動脈瘤を除いてはさらに稀となる．

　今回われわれは，珍しいfrontopolar artery aneu-rysmの2手術例を経験したのでここに報告する．

We report two very rare cases of subarachnoid hemorrhage due to a ruptured frontopolar artery aneurysm in the cingulate sulcus. Only two surgically treated cases have been reported.

Case 1: A 69-year-old woman suffered headache and was admitted to our hospital the next day. Computed tomo-graphy (CT) revealed focal subarachnoid hemon-hage (SAH) in the interhemispheric fissure. Cerebral angiography on admission failed to show an aneurysm, but follow-up study on day 14 revealed a small aneurysm in the cingulate sul-cus at the origin of the frontopolar artery arising from the callosomarginal trunk.