脊髓室管膜瘤的MRI表现分析

MR imaging features of spinal cord ependymoma

目的分析脊髓内室管膜瘤的MRI表现,提高其诊断准确率。方法回顾性分析经手术病理证实的27例脊髓内室管膜瘤,所有病例均行MRI平扫及增强检查。分析肿瘤的发病部位、范围、生长方式、信号特点、瘤内及瘤周囊变、含铁血黄素沉积及强化方式。结果所有肿瘤均呈中心性膨胀性生长,平均累及3.6个椎体水平,T1WI上以等或低信号为主,T2WI上以不均匀高信号为主,60%以上病例可见瘤内及瘤周囊变,约26%病例可见"帽征",约90%病例可见明显均一或不均一强化。结论脊髓内室管膜瘤MRI表现具有一定特征,掌握这些特征有助于术前诊断。

Objective To analyze the MR imaging features of spinal cord ependymoma and to improve diagnostic accuracy.Methods Twenty-seven patients with histologically proved spinal cord ependymoma were included.MR imaging feature analysis included tumor location,size,pattern of growth,signal intensity,cysts in or adjacent to the tumor,hemosiderin deposition,and enhancement pattern.Results All tumors showed centric and expansible growth,and the average number of vertebral segments involved by tumors was 3.6.The tumors mainly presented with slightly long T1 and mixed long T2 signal intensity.60% of the cases showed cysts in or adjacent to the tumors,26% showed ＇cap sign＇,and 90% demonstrated homogeneously or heterogeneously obvious enhancement.Conclusions Spinal cord ependymomas have some MRI features,which are helpful to make correct diagnosis before operation.