前交通动脉瘤占颅内动脉瘤的28.3～34.6％,它是蛛网膜下腔出血的常见病因。兹有1例两次蛛网膜下腔出血发作后,经脑血管造影证实为巨大前交通动脉瘤,本文报导该例动脉瘤在应用甘露醇阻断供血动脉下,直接手术切除获得成功的经验,并介绍暂时阻断供血动脉的作法。病例介绍病人男性,27岁,211365号,于1983年6月24日 Anterior communicating aneurysms account for 28.3 to 34.6% of intracranial aneurysms, which is a common cause of subarachnoid hemorrhage. There are 1 cases of subarachnoid hemorrhage after two episodes of cerebrovascular angiography proved to be a huge anterior communicating aneurysms, this article reports the cases of aneurysm in the application of mannitol blocking the feeding artery, the direct surgical resection to obtain successful experience, And introduced the temporary blocking of the feeding arteries. Case Presentation Patient Male, 27 years old, 211365, on June 24, 1983