目的　总结不典型脑损伤的CT表现。方法　搜集 1996～ 2 0 0 2年CT检查脑外伤 14 5 2 0例 ,对关心区采取减薄扫描或HRCT检查。诊断迟发和不典型脑损伤 5 3例。首诊未发现异常或考虑为其他病变 ,随诊复查确诊为脑损伤改变。结果　 17例脑挫伤中点状高密度灶 9例 ,片状低密度灶 8例。 3 6例迟发性脑损伤中脑肿胀 9例 ,轴索损伤 7例 ,散在小血肿 5例 ,迟发硬膜下血肿 15例。结论　CT诊断脑外伤有重要价值 ,但对不典型表现应高度警惕 ,随诊复查尤其对老年外伤者意义重大 Objective To summarize the CT findings of atypical brain injury. Methods A total of 14 520 traumatic brain injury cases from 1996 to 2002 were collected. Thinning scans or HRCT were performed on the regions of interest. Diagnosis of late and atypical brain injury in 53 cases. The first diagnosis found no abnormalities or consider other lesions, followed up for diagnosis of brain injury changes. Results Among the 17 cases, 9 cases of focal high density lesions were found in brain contusion and 8 cases of low density lesions. There were 9 cases of cerebral edema in 3 6 cases of delayed brain injury, 7 cases of axonal injury, 5 cases of scattered small hematoma and 15 cases of delayed subdural hematoma. Conclusion CT diagnosis of traumatic brain injury has an important value, but atypical manifestations should be highly vigilant, follow-up review, especially for elderly trauma were significant