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目的：提高对急性外伤性小脑幕裂孔下疝ＣＴ改变的认识。方法：回顾性分析４０例经临床证实的急性小脑幕裂孔下疝的ＣＴ表现。结果：海马钩回移位征１３例（３２．５％）；脑干变形３３例（８２．５％），移位２９例（７２．５％），旋转８例（２０％）；脑干周围池不同程度的变形、闭塞；临床疝晚期患者中，第四脑室严重变形、闭塞者１２例（９２．３％）。结论：ＣＴ为临床判断急性小脑幕裂孔下疝的形成程度提供可靠的影像学依据。第四脑室的变形、闭塞可作为ＣＴ诊断晚期疝的主要依据。
OBJECTIVE: To improve the understanding of CT changes in inferior traumatic hernia in acute traumatic cerebellar procession. Methods: A retrospective analysis of 40 cases of clinically confirmed acute cerebellar subacute herniation CT findings. Results: 13 cases (32.5%) had hippocampal remodeling, 33 cases (82.5%) had brainstem deformity, 29 cases (72.5%) were displaced and 8 cases (20% Around the pool of varying degrees of deformation, occlusion; advanced clinical hernia patients, the fourth ventricle severe deformation, occlusion in 12 cases (92.3%). Conclusion: CT provides a reliable imaging basis for judging the degree of suboccipito hernia formed in acute cerebellum. Fourth ventricle deformation, occlusion can be used as the main basis for the diagnosis of advanced hernia CT.