MRI常规扫描结合DWI对髓母细胞瘤的诊断价值

The diagnostic value of MRI conventional scanning combined with DWI in medulloblastomas

目的 :评价MRI常规扫描结合DWI对髓母细胞瘤的诊断价值。方法 :搜集经手术病理证实的髓母细胞瘤 2 3例 ,均行MRI常规扫描 ,7例行DWI。结果 :髓母细胞瘤常见于小脑蚓部 (1 5例 ,占 6 5 .2 %) ,易囊变 (1 9例 ,82 .6 %) ,4例出现转移 (1 7.4 %)。瘤体T1 WI呈等或稍低信号 ,T2 WI等或稍高信号 ,注射Gd DTPA后呈中等至明显强化。肿瘤实性部分DWI呈略高信号 ,ADC图呈略低信号。坏死囊变部分与脑脊液信号相仿。瘤周水肿DWI呈等及稍高信号 ,ADC图呈稍高及高信号。结论 :常规MRI结合DWI对髓母细胞瘤的诊断和鉴别诊断有重要价值。

Objective:To evaluate the value of MRI conventional scanning combined with DWI in diagnosis of medulloblastomas.Methods:23 surgical pathologic proven patients were studied by using MRI conventional scanning,7 of them using DWI also.Results:Medulloblastoma lay on vermis of cerebellum most frequently (15 cases ,65.2%).Cyst malformation was common (19 cases,82.6%). Metastasis were found in 4 cases(17.4%).They appeared iso-or slightly hypointense on T 1WI and iso-or slightly hyperintense on T 2WI with moderate to marked enhancement after Gd-DTPA injection.These tumor's solid portions gave slightly high signal on DWI,and slightly low signal on ADC map.The signal of necrosis and cystic lesions was similar with CSF. Peritumoral edema appeared equal or slightly high signal on DWI and slightly high or high signal on ADC map.Conclusion:Conventional MRI combined with DWI play an important role in diagnosis and differential diagnosis of medulloblastoma.