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【单选题】
关于胰腺癌的MRI表现，错误的是A.
T 1 WI上呈低信号
B.
动态增强扫描动脉期病灶明显强化
C.
T 2 WI上其信号一般略高于胰腺
D.
动态增强扫描延迟期肿瘤信号变化无特征
E.
可见主胰管扩张
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