由颈内动脉壁间动脉瘤被破裂引起的蛛网膜下腔出血(SAH)很少引起临床医师注意。作者报告从1995～1999年5年间41所医院收治的18例ICA壁间动脉瘤破裂引起的SAH患者,年龄27-83岁,平均52岁,11例(61％)为中年女性,8例(44％)有高血压,13例(72％)入院前有再出血,6例(33％)入院时Hunt和Hess分级为Ⅳ-Ⅴ,根据CT扫描情况确定的Fisher分级为3 Subarachnoid hemorrhage (SAH) caused by the rupture of the intercarotid artery wall aneurysm rarely draws the attention of clinicians. The authors report 18 patients aged 27-83 years (mean 52 years) with SAH caused by ruptured intracavitary aneurysm in ICA from 41 hospitals in 41 hospitals from 1995 to 1999. Eleven patients (61%) were middle-aged women and eight patients (44%) had hypertension, 13 (72%) had rebleeding before admission, and 6 (33%) were admitted to the hospital with Hunt and Hess grade IV-V and a Fisher grade of 3 based on CT scans