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目的 :分析Moyamoya病的CT、MRI、MRA和DSA的综合影像特征。方法 :回顾性分析 12例CT、5例MRI及MRA、12例DSA的影像资料 ,比较各自的特点。应用GE 1.5T超导型MR系统行SE、FSE序列MRI和三维时间飞跃法MRA。结果 :CT显示低年龄组 (<30岁 )主要为多发性皮层下缺血并不对称性皮质萎缩。高年龄组 (>30岁 ) ,主要以基底节区多发腔隙性梗塞、脑萎缩 ,或脑实质出血、蛛网膜下腔出血。MRI显示闭塞血管流空效应消失 ,侧支循环流空信号增多 ,脑实质缺血或出血改变。MRA直接显示狭窄或闭塞的血管及侧支血管网。与DSA对比 ,MRA能够准确地显示闭塞或狭窄的大血管和代偿的侧支血管网。结论 :CT平扫仍是发现Moyamoya病继发病变的常规方法 ,MRI和MRA相结合可正确诊断Moyamoya病 ,避免或减少血管造影的次数。
Objective: To analyze the comprehensive imaging features of CT, MRI, MRA and DSA in Moyamoya disease. Methods: The imaging data of 12 cases of CT, 5 cases of MRI and MRA and 12 cases of DSA were retrospectively analyzed, and their characteristics were compared. The GE 1.5T superconducting MR system was used to perform SE, FSE sequence MRI and three-dimensional time leap MRA. Results: CT showed that the lower age group (<30 years) was predominantly with multiple subcortical ischemia and asymmetric cortical atrophy. High age group (> 30 years old), mainly in the basal ganglia multiple lacunar infarction, brain atrophy, or intraparenchymal hemorrhage, subarachnoid hemorrhage. MRI showed occlusion of vascular emptying effect disappeared, collateral circulation flow signal increased, parenchymal ischemia or bleeding changes. MRA directly shows narrow or occluded blood vessels and collateral vessels. Compared with DSA, MRA can accurately show the occlusion or stenosis of large blood vessels and compensatory collateral vessels. Conclusion: CT scan is still a common method for detecting secondary lesions of Moyamoya disease. The combination of MRI and MRA can correctly diagnose Moyamoya disease and avoid or reduce the number of angiography.