摘要
目的:探讨小脑半球髓母细胞瘤的MRI表现,提高对髓母细胞瘤的认识。方法:8例经手术病理证实的小脑半球髓母细胞瘤患者,男5例,女3例,年龄1～33岁,所有病例均行MRI平扫及增强扫描,其中2例行CT平扫,回顾性分析其临床及影像学表现。结果:肿瘤位于小脑半球深部4例,小脑半球表面且突向桥小脑角区2例,双侧小脑半球及小脑蚓部多发病灶2例。肿瘤内发生囊变5例,囊变区大小不一,3例位于肿瘤周边,2例位于中央,其内壁光滑。MRI平扫肿瘤实性部分T1WI呈稍低信号,T2WI呈等信号或稍高信号,且信号不均匀,5例肿瘤周围有轻度水肿。增强扫描3例肿瘤有轻度强化,5例中度强化,其中1例有脑回状强化。2例CT平扫示肿瘤呈稍高密度。结论:小脑半球髓母细胞瘤的MRI表现具有一定特征性,MRI检查对诊断本病有重要价值。
Objective：To evaluate the MRI findings of cerebellar medulloblastoma,in order to enhance the knowledge of this tumor. Methods;The clinical and imaging findings of eight patients with cerebellar medulloblastoma proved by surgery and histopathology were analyzed retrospectively. There were 5 males and 3 females,the age ranged from 1 to 33 years. Pre-and post-contrast MRI were performed in all patients,2 patients had plain CT scan. Results：The locations of tumors included the deep part of cerebellar hemisphere （n= 4）, the surface of cerebellar hemisphere and extruding to cerebellopontine angle region （n= 2）, multiple lesions at bilateral cerebellum and vermis （n= 2）. Intra-tumoral cystic component with smooth inner wall was found in 5 tumors,which located at the peripheral part of tumor （n=3） and at the center of tumor （n=2）. On pre-contrast MRI,the solid part of mass demonstrated heterogeneous signal intensities, which manifested as slight hy- pointensity on T1WI and slight hyperintensity on T2 WI. Mild peritumoral edema was found in 5 cases. After contrast admin- istration, tumor enhanced mildly （n= 3） or moderately （n= 5） ,gyri-form enhancement was assessed in one of these 5 cases. Slight hyper-attenuation of the tumor was demonstrated on plain CT scan in 2 cases. Conclusion：Certain MRI characteristics of cerebellar hemisphere medulloblastoma were revealed,MRI has significant value in the diagnosis of this disease.
出处
《放射学实践》
北大核心
2009年第11期1191-1194,共4页
Radiologic Practice
关键词
磁共振成像
小脑半球
髓母细胞瘤
Cerebellar hemisphere
Medulloblastoma~ Magnetic resonance imaging
