前大脳動脈水平部前頭極動脈分岐部脳動脈瘤の1例

A Ruptured Aneurysm in the Bifurcation of the Proximal Anterior Cerebral Artery and the Frontopolar Artery:Case Report

Ⅰ．はじめに

　前大脳動脈領域の脳動脈瘤の好発部位は，前交通動脈と前大脳動脈遠位部（A2）である．しかし，比較的稀ではあるが前大脳動脈水平部（A1）にも発生することが報告されている．その中でも，前大脳動脈水平部皮質枝分岐部動脈瘤は今まで4例しか報告がない．今回われわれは前大脳動脈水平部前頭極動脈分岐部動脈瘤の1例を経験したので文献的考察を加えて報告する．

We report a case of ruptured aneurysm in the bifurcation of the proximal anterior cerebral artery and the frontopo-lar artery. A 49-year-old woman complained of sudden onset of severe headache on December 24, 2000. She was ad-mitted to our hospital and CT scan revealed subarachnoid hemorrhage. Cerebral angiography on the next day revealed an aneurysm in the bifurcation of the frontopolar artery and the proximal anterior cerebral artery. She was operated on using the left pterional approach and complete neck clipping was performed. The post-operative course was uneventful.