髓母细胞瘤的CT、MRI分析  

CT and MRI analysis of medulloblastomas

作　　者：薛鹏[1] 谢晓刚[1] 弓莉[1] 杨纪周 

机构地区：[1]郑州市第五人民医院放射科,河南郑州450003

出　　处：《医学影像学杂志》2006年第3期220-222,共3页Journal of Medical Imaging

摘　　要：目的:通过对髓母细胞瘤CT及MRI的影像分析,提高对本病的认识。方法:搜集经手术病理证实的髓母细胞瘤19例,全部病例均有CT和/或MRI资料。结果:19例中,肿瘤位于小脑蚓部15例,小脑半球4例。CT平扫肿瘤稍高密度9例,等密度2例,混杂密度3例,内伴斑片低密度灶及囊性变8例,有斑点状及斑片状钙化3例,CT增强扫描多强化明显。T1WI稍低信号10例,等信号及混杂信号2例,T2WI略高信号及混杂信号10例,等信号2例,肿瘤边缘较清楚,伴瘤周水肿9例。增强肿瘤均匀强化6例,不均匀强化4例。共15例见有第四脑室变形偏移及幕上脑室扩张。结论:常见髓母细胞瘤有特定的发生部位、好发年龄段及特征性CT和MRI表现,容易诊断;不典型髓母细胞瘤的表现在鉴别中要想到此病以减少误诊。Objective： To promote the knowledge of medulloblastomas through analyzing cr and MRI features. Methods： 19 cases with medulloblastoma proved by surgery and pathology had examined by CT or MRI scanning. Results： In this series of 19 cases with medulloblastoma, the lesion located in vermis in 15 cases and in cerebellar hemisphere in 4 cases. On CT plain scans, the tumors were slightly hyperdense in 9 cases, isodense in 2 cases and inhomogeneous density in 3 cases, the dotted hypodensity and cystic components in 8 cases and dotted calcification in 3 eases; many tumors were markedly enhanced on contrast CT image. MRI findings included： slightly hypointense in 10 eases and inhomogeneous isointense in 2 eases on T1WI, inhomogeneous slightly hyperintense in 10 eases and isointense in 2 cases on T2WI; tumors featured peritumoral edema in 9 cases. MRI showed homogeneous and inhomogeneous enhancement in 6 and 4 respectlvely, the fourth ventricle was deformed or deviated in 15 cases. Conclusion： The medulloblastoma have specific location, ages, characteristics and therefore are easy to diagnose. Identifying non-typical medulloblastoma are important to diminish misdiagnosis.

关 键 词：髓母细胞瘤 体层摄影术 X线计算机 磁共振成像 

分 类 号：R739.41[医药卫生—肿瘤] R445.2[医药卫生—临床医学]