儿童髓母细胞瘤的影像学表现

Imaging features of medulloblastoma in children

目的：为了提高对儿童髓母细胞瘤影像诊断的准确率,本文主要探讨儿童髓母细胞瘤的CT及MRI影像学表现。方法：回顾性分析了62例儿童髓母细胞瘤的CT及MRI影像资料。其中男43例、女19例,年龄2～18岁。62例均进行了MR扫描,51例又进行了CT扫描。62例全部经手术、病理证实。结果：62例髓母细胞瘤中56例位于小脑蚓部,6例位于小脑半球,其中18例累及四脑室侧孔区;47%的病例肿瘤中发现钙化;MR扫描8例呈等T1等T2信号,54例呈长T1长T2信号,61例呈不同程度的不均匀强化。影像报告诊断准确率为60%。结论：儿童髓母细胞瘤有其典型的好发部位及特征性影像表现,掌握其影像学特点及鉴别诊断要点,可以提高影像诊断的准确率,降低误诊率。

Objective：To analyze imaging features of medulloblastoma in children,in order to improve the diagnostic accuracy.Methods：Imaging findings of 62 children with pathologically proved medulloblastoma were retrospectively studied.The patients included 43 boys and 19 girls,with onset age ranging from 2to 18 years old.All 62 patients underwent pre- and post-contrast MRI studies.Moreover,51 patients underwent CT scan.Results：Among 62 cases with melulloblastoma,56 lesions located at the cerebellar vermis,and the other 6lesions were in the cerebellar hemisphere.About 47% of lesions had calcification.Eight cases showed iso-intensity on both T1 and T2 weighted image.Other 54 cases showed hypo-intensity on T1 weighted image and hyper-intensity on T2 weighted image.61 lesions showed heterogeneous enhancement with different degree of intensity.The rate of correct diagnosis with MRI was 60%.Conclusions：Medulloblastoma in children has typical location and imaging features.Being familiar with imaging findings of medulloblastoma may help to improve imaging diagnostic accuracy.