椎基底动脉延长纡曲症的MRI评价

The MRI Evaluation of Vertebrobasilar Dolichoectasia

目的探讨椎基底动脉延长纡曲症（VBD）的MRI表现及其临床意义。资料与方法回顾分析21例VBD患者的影像资料。21例均接受MR头颅平扫，13例行头颅磁共振血管造影（MRA），4例有强化，12例接受螺旋CT平扫。利用MRI对基底动脉的各项指标进行评价、分析。结果2l例MRI表现为基底动脉明显扩张，直径为5-10mm，其中13例向右扭曲延长；8例向左扭曲延长。14例有第Ⅶ、Ⅷ、Ⅺ、Ⅴ对颅神经受累症状。8例在MRI平扫中见后循环梗死灶。结论MRI及MRA联合应用可以清楚显示基底动脉的解剖及其与后颅凹结构的关系，显示附壁血栓和夹层动脉瘤。可作为VBD诊断的首选影像学方法。

Objective To discuss the MRI feature and clinical significance of vertebrobasilar doliehoectasia（VBD）. Materials and Methods The radiographic data of 21 patients with VBD were retrospectively reviewed. All patients were performed with MRI scan, 4 patients with enhanced MR scan, 13 patients with MR angiography, 12 patients were underwent spiral CT examinations. The diameter, height and most lateral position of the basilar arteries were assessed on MRI scans. Results Dilatation and elongation of the basilar artery was very pronounced in 21 patients, the diameter of the basilar artery were in size from 5 to 10mm. 13 of which tortuous basilar arteries were courses from left to right, 8 arteries were courses from right to left. 14 patients had symptoms of involvement of the Ⅶ, Ⅷ,Ⅺ,Ⅴ cranial nerves. The 8 patients had ischemic lesions in posterior circulation on MRI scan. Conclusion MRI and MRA have the ability to display basilar artery anatomy and its relation to posterior fossa structures, to delineate mural thrombi and dissections, MRI is Fast choice to the diagnosis of vertebrobasilar dolichoectasia.