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目的：提出一个脑血管造影征象，即“大脑前动脉水平段优势血流征”（简称Ａ１优势）。并探讨了该征象的形成，及与前交通动脉瘤的关系。材料与方法：统计分析了８７例颅内动脉瘤的ＤＳＡ资料。结果：在２７例前交通动脉瘤患者中，１８例有Ａ１优势。其中１７例前交通动脉瘤发生在Ａ１优势侧，仅１例发生在对侧。结论：本组资料表明前交通动脉瘤多发生在同侧Ａ１优势血流者，因此，这一征象对诊断前交通动脉瘤具有重要意义
OBJECTIVE: To present a cerebral angiography sign, which is “predominant blood flow sign of anterior cerebral artery” (referred to as A1 superiority). The formation of the signs and the relationship with the anterior communicating artery aneurysm were also discussed. Materials and Methods: DSA data of 87 patients with intracranial aneurysms were statistically analyzed. Results: Of the 27 patients with anterior communicating aneurysms, 18 had A1 superiority. Of the 17 cases, the anterior communicating artery aneurysms occurred on the superior side of A1 and only one occurred on the contralateral side. Conclusion: The data in this group show that anterior communicating artery aneurysm occurred in the ipsilateral A1 superior blood flow, therefore, this signification is of great significance for the diagnosis of traffic artery aneurysm