目的：探讨大脑前动脉水平段（ A1段）优势征与前交通动脉瘤（ ACoAA ）形成的关系。方法分析173例患者的64排CT血管成像（CTA）检查资料，并按CTA结果分为ACoAA组（83例）与正常对照组（90例）。观察指标：有无动脉瘤，动脉瘤的部位、形态、大小和瘤颈宽度、瘤顶指向及瘤体与周围结构的关系等，判定结果与手术及DSA结果进行对照。同时观察大脑前动脉A1段是否发育不良或缺如，是否存在一侧大脑前动脉A1段优势征。结果 ACoAA组中显示一侧大脑前动脉A1段优势征者的比率达80．7％，明显高于正常对照组的16．7％（P＜0．05）。结论一侧大脑前动脉A1段优势征，另一侧A1段发育不良或缺如与ACoAA的发生有密切关系。%Objective To investigate the relationship between the dominant A 1 segment and presence of the anterior communicating artery aneurysm .Methods The data of 64-slice computed tomography angiography ( CTA ) of 173 cases were analysed retrospectively .The 173 cases were divided into anterior communicating artery aneurysm (ACoAA) group(83 cases) and control group (90 cases).The observation items were the presence of aneurysm and the location , shape, size, neck, axis point of every one aneurysm and the relationship of aneurysms to parent vessels and other branches and bone structure .The results of aneurysms were compared with clipping or coiling , at the same time, to observe the A1 segment of anterior cerebral artery whether had dysplasia or absence , whether existed the dominance of A 1 segment of anterior cerebral artery .Results The rate of display the dominance of A1 segment of anterior cerebral artery (80.7%) in the ACoAA group was higher than that in the control group (16.7%) ( P <0.05 ).Conclusion The development of the anterior communicating artery aneurysm closely related with the the dominance of A 1 segment of anterior cerebral artery and the dysplasia or absence of A 1 segment of anterior cerebral artery .
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