肿瘤样脑炎的MRI表现分析

目的:探讨肿瘤样脑炎的MRI表现。方法:回顾性分析本院10例肿瘤样脑炎患者的MRI资料,所有病例均行MRI平扫及增强检查。结果:肿瘤样脑炎平扫呈长T1、长T2不均匀信号,边界欠清晰,周围有水肿带,灰白质同时受累,占位征象较轻。增强扫描4例呈单发结节或环形伴核心样明显强化,6例为单发或多发偏心结节状明显强化,有5例(5/10)伴邻近脑膜线状强化、其中2例(2/10)同时有脑回状强化。结论:肿瘤样脑炎MRI平扫表现缺乏特征性,增强扫描表现有一定特征性,充分认识其MRI表现并结合临床对肿瘤样脑炎的诊断及鉴别诊断有重要意义。

MRI analysis of tumor-like encephalitis

Objective：To investigate the MRI findings of tumor-like encephalitis. Methods：The MRI findings of ten cases with tumor-like encephalitis were retrospectively analyzed. All cases had MRI without and with contrast enhancement. Results：The tumor like encephalitis lesions showed heterogeneous long T1 and long T2 signal intensities on plain MRI, ill- defined margins and accompanied with peripheral edema. The gray and white matter were simultaneously involved while signs of space occupying were mild. After contrast enhancement, solitary nodular or ringqike lesions with markedly en- hanced core were assessed in 4 cases,6 cases showed solitary or multiple eccentric nodular marked enhancement. Linear en- hancement adjacent to meninges could be seen in 5 （5/10） cases,of them,2 （2/10） cases showed gyri-like enhancement sim- ultaneously. Conclusion： No specific plain MRI findings could be showed in tumor-like encephalitis, certain characteristic fea- tures could be showed after enhancement. Fully understanding of the MRI manifestations of ＂tumor-like encephalitis and correlated with clinical findings play an important role in the diagnosis and differential diagnosis.