CT阴性脑弥漫性轴索损伤的影像学诊断

目的探讨MPd对CT阴性的脑弥漫性轴索损伤（DAI）的影像学诊断价值。方法回顾性分析58例临床疑为脑弥漫性轴索损伤而CT表现为阴性患者的MR／表现。所有患者均在伤后2d内接受CT与MR检查。CT采用常规程序扫描，MRI采用自旋回波T1 WI、T2WI序列、液体衰减反转恢复序列（FLAIR）及弥散加权成像（DWI）。结果CT仅见弥漫性脑肿胀，未见明确病灶；MRI可见弥漫性脑肿胀，脑干、胼胝体及脑白质小灶性损伤。58例患者中，MRI各序列共检出216个病灶。MRI对脑弥漫性轴索损伤病灶的敏感性明显优于CT。结论MRI为CT阴性的DAI临床诊断提供了直接可靠的影像学依据。

Value of imaging diagnosis of diffuse axonal injury in patients with normal CT

Objective To investigate the value of MRI in the diagnosis of acute diffuse axonal injury（DAI） when CT imaging is normal. Methods 58 cases having brain trauma, with clinical diagnosis as acute diffuse axonal injury, while CT imaging was nomorl, were selected to receive MRI examination within 2 days after injury. The imaging data MR/were retrospectively analyzed. Results All the 216 lesions were found in MR/. The imaging manifes- tations on MRI were diffuse cerebral swelling and subcortical lesions. Brainstem and corpus cotlosum lesions were appeared in the severe eases. Most of which were small and non - homorrhagie. Conclusion MRI was markedly superior to CT in demonstrating the content and degree of DAI. It plays an important role in the diagnosis of DAI in patients with normal CT.