成人小脑髓母细胞瘤的MRI表现  

MRI Findings of Cerebellar Medulloblastoma in Adults

作　　者：潘冬梅[1] 范国华[1] 沈钧康[1] 龚建平[1] 

机构地区：[1]苏州大学附属第二医院影像科江苏省苏州市三香路1055号,苏州215004

出　　处：《中国医学计算机成像杂志》2015年第3期201-204,共4页Chinese Computed Medical Imaging

摘　　要：目的：探讨成人小脑髓母细胞瘤的MRI表现及其诊断价值。方法：回顾性分析12例（男5例,女7例,年龄26~49岁,中位年龄28岁）经手术病理证实的成人小脑髓母细胞瘤MRI资料,所有病例均行1.5T MRI平扫及增强扫描。结果：右侧小脑半球4例（其中1例为多发病灶）,左侧小脑半球6例,小脑蚓部2例。肿瘤T1WI呈稍低信号,T2WI及FLAIR呈等或稍高于小脑灰质信号,DWI呈稍高信号;肿瘤内部可见裂隙状或斑片状T1WI低、T2WI高信号;肿瘤周围可见片状或环状水肿。增强扫描10例呈渐进性轻中度强化,2例明显强化。均未见蛛网膜下腔种植转移。结论：成人小脑髓母细胞瘤以小脑半球多见,可多发,易囊变,增强扫描呈渐进性轻中度强化,较少出现蛛网膜下腔种植转移,MRI表现具有一定的特征性。Purpose： To explore the value of MRI in diagnosis of cerebellar medulloblastoma in adults. Methods： Twelve adult patients with cerebellar medulloblastoma confirmed by operation and pathology results were retrospectively reviewed. All patients underwent MRI plain scan and contrast enhancement scan. The location, shape, signal and enhancement characteristics of the tumors were analyzed. Results： Among 12 cases, 4 cases were located in the right cerebellar hemisphere （1 case had multiple lesions）, 6 cases were located in the left cerebellar hemisphere and 2 cases were located in the cerebellar inferior vermis. The tumors showed slight hypo-intensity signal on T1WI, hyper-intensity signal on T2WI and FLAIR compared with normal gray matter of the cerebellar, slight hyper-intensity signal on DWI. Cleft-like or patchy-like cystic degeneration or necrosis was found inside the tumors with low intensity on T1WI, high intensity on T2WI. Around them, there was patchy or ring-like vasogenic edema. Ten cases had gradual mild to moderate enhancement and 2 cases had marked enhancement. There were no subarachnoid planting metastases in all 12 cases. Conclusion： Most cerebellar medulloblastoma in adults occurred in cerebellar hemispheres, which may be multiple. The type of desmoplastic/nodular is predominantly seen in adults. The tumors are vulnerable cystic and mainly as small patchy or slit-like, which showed gradual mild to moderate enhancement. They have less subarachnoid planting metastasis. Therefore, the MRI manifestations have certain characteristics in diagnosis of the cerebellar medulloblastoma in adults.

关 键 词：髓母细胞瘤 成人 小脑 磁共振成像 

分 类 号：R445.2[医药卫生—影像医学与核医学]