Increased heterogeneity of the SEH was found as time progressed.Three of 5 cases received intravenous contrast media and showed enhancement of the SEH on MRI.

• 在五位接受静脉注射对比剂的患者中，有三位早期硬膜上血肿块中出现显影剂增强，其原因可能为急性出血致对比剂渗漏或急性扩大的血肿块包埋了部份硬膜上的软组织。