长巨脑动脉的影像诊断

Imaging Diagnosis of Dolichoectasia of Cerebral Arteries

目的 :探讨长巨脑动脉的影像特征。材料与方法 :对 13例患者的MRI表现、DSA或MRA显示的异常血管分布和形态进行分析。结果 :MRI能够显示位于桥前池、鞍上池等处粗大的血管流空信号、病变压迫的确切部位 (颅神经、脑干、颞叶内侧 )、脑缺血灶以及伴随的脑动静脉畸形。无以往的出血表现。血管造影显示延长、增宽和扭曲的脑血管 ,8例发生在椎 基底动脉 ,2例发生在颈动脉 ,3例两系统同时受累。有 1例伴有一侧颈动脉闭塞 ,另 2例分别伴发脑动静脉畸形和多发脑动脉瘤。结论 :MRI和血管造影技术相结合 。

Purpose: To study the imaging features of dolichoectasia of cerebral arteries. Materials and Methods: The MRI appearance and the abnormal distribution and morphology of the affected arteries on DSA or MRA were reviewed and analyzed in 13 cases. Results: MRI could display large flow void vessels lying the prepontine and/or suprasellar cisterns, the accurate sites (cranial nerves, brainstem and inner part of the temporal lobe) compressed by the vessels, brain infarcts as well as accompanied vascular malformation without the appearance of previous hemorrhage. On angiography, the involved arteries were elongated, dilated and tortuous. Lesions were confined to the vertebral and/or basilar arteries in 8 cases, carotid arteries in 2, and both systems in 3. Associated occlusion of unilateral carotid artery was found in 1 case, multiple cerebral aneurysms and an arteriovenous malformation in other 2 respectively. Conclusion: The combination of MRI and angiography provide valuable information in the diagnosis of these patients.