脳底動脈窓形成部の脳動脈瘤

Saccular Aneurysm arising from the Basilar Artery Fenestration: A case report

I．はじめに

　脳底動脈に窓形成があり，さらにこの部に動脈瘤のみられた症例の報告は，今日までにわれわれの渉猟しえた範囲では9例で^{2,3,5-7,15,19,24）}，そのうち直達手術が行われたのは4例^2,7,15）にすぎない．

This patient, 29-year-old female, had an attack of subarachnoid hemorrhage. On admission a cerebral angiogram showed a saccular aneurysm arising from the proximal origin of the fenestrated basilar artery (Fig. 1). The aneurysm was clipped successfully with two steps under a right retromastoidal suboccipital craniectomy (Fig. 2).

Association of the fenestrated basilar artery and saccular aneurysm is rare. To our knowledge, 9 cases have been found in the literature and only 4 cases were operated. The authors discussed the pathogenesis and treatment of such aneurysms.