46例脑动静脉畸形的MRI和MRA分析

目的：探讨MRI和MRA检查在脑AVM临床诊断中的价值。方法：46例脑动静脉畸形作了常规MRI和MR血管造影，MRI采用SET1、T2加权成像，MRA采用三维时飞跃法。结果：MRI准确显示了46例AVM的瘤巢，11例可见亚急性出血灶，5例可见含铁血黄素沉积，23例病灶区组织软化或萎缩，4例有占位效应。3D-TOF RMA显示41例AVM供血动脉、23例引流静脉。5例加做增强3D-TOF及6例加做2D-TOF后，引流静脉显示明显改善。结论：MRI和MRA结合应用能对脑血管畸形作出较准确的诊断，为临床治疗提供所需的基本信息并对治疗效果作出客观的评价。

MRI and MRA analyses of 46 cerebral AVM

Objective:To evaluate the clinical value of conventional MR imaging and MR angiography in the diagnosis and delineation of cerebral arteriovenous malformations.Methods:46 cases with cerebral AVM were studied retrospectively with conventional MR imaging and MR angiography,MRI was performed with SE T 1 and T 2 weighted sequence,and MR angiography was completed with three-dimentional time-of-flight method.Results:46 nidus of cerebral AVM,11 subacute hemorrhage lesions and 5 hemosiderin lesions etc were showed clearly on MR imaging.On 3D-TOF MR angiography,41 feeding arteries and 23 drainage veins were seen and in the delineation of venous drainage patterns,contrast-enhanced MRA and 2D-TOF angiography were superior to 3D-TOF.Conclusion:Conventional MR imaging and MR angiography are essential as a noninvasive tools for diagnosis and planning stereotactic radiosurgery of cerebral arteriovenous malformations.