内頸動脈・後交通動脈分岐部漏斗状拡張を思わせる小動脈瘤破裂の2例

Ruptured ICPC Junction Aneurysm Revealed Angiographically Only Small Bulging

Ⅰ．はじめに

　直径3mm以下の脳動脈瘤の破裂は稀であり，特に内頸動脈・後交通動脈分岐部のものではjunctional dilatationとまちがわれやすく，破裂かどうかの判定が難しく，直接手術の決断に不安を感ずる．今回われわれはそのような破裂動脈瘤を経験したので，診断，手術適応に関し若干の考察を加えた．

Two cases revealed only small bulging at ICPC junction on carotid angiogram after subarachnoid hemorrhage were reported. One case was treated conservatively and other was operated. The diagnosis and operative indication of these cases were discussed.

The authors think that all of these cases, whether these bulging are classified angiographically as aneurysm or junctional dilatation, should be operated positively when CT scan shows high density area due to subarachnoid hemorrhage around them and there are no other findings inducing subarachnoid hemorrhage on angiograms.