The aneurysms were located at the distal portion of the cerebral arteries ( posterior inferior cerebellar artery and callosomarginal artery). Repeat angiography was performed on case 1 after a period of conservative therapy. 动脉瘤位于脑动脉的末梢部位(小脑后下动脉和胼缘动脉),例1经保守治疗一段时期后重复了血管造影,该瘤有扩大。