The rADC in tumor and far peritumoral region has no significance in distinguishing high grade gliomas and solitary metastases, whereas the rADC in adjacent peritumoral region plays an important role in distinguishing them.

• 测定高级胶质瘤与单发脑转移瘤瘤体及远瘤周区的rADC值在二者鉴别诊断中的价值不大,测定二者近瘤周区的rADC值在二者鉴别诊断中具有一定的价值。