内頸動脈の自然閉塞をきたした頭蓋内巨大内頸動脈瘤の2例

Two Cases of Spontaneous Occlusion of Internal Carotid Artery due to Giant Intracranial Internal Carotid Artery Aneurysm

I．はじめに

　巨大脳動脈瘤の内腔自然閉塞例の報告はときに散見され，Whittle^9）によるとその13-20％の頻度で起こるとされている．今回われわれは，内腔が自然閉塞するとともに，その親動脈である内頸動脈の閉塞をきたした頭蓋内巨大内頸動脈瘤の2症例を経験したので報告する．

Although spontaneous thrombosis of a giant intracra-nial aneurysm is comparatively commom, its parent artery occlusion is rare. Recently we experienced two cases in which spontaneous thrombosis of giant in-tracranial internal carotid artery aneurysm and occlu-sion of its parent artery were occurred.

Case 1. A 49-year-old man, complaining esotropia was refered to us by an ophthalmologist. He had no particular past history. Neurological examination re-vealed left oculomotor, abducense palsy and disturb-ance of left trigeminal first branch. CT scan revealed a round high density mass in the left middle fossa.