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收集１１７例经手术和病理证实的后颅凹占位病变病例，其中肿瘤１１４例，囊肿３例。髓母细胞瘤、星形细胞瘤及室管膜瘤多发生于青少年。小脑桥脑角好发听神经瘤、脑膜瘤、胆脂瘤，往往有四脑室侧移和后移。小脑蚓部好发髓母细胞瘤，占８２．４％，可引起四脑室前移。四脑室好发室管膜瘤，占８０％，引起四脑室扩大。小脑半球好发血管母细胞瘤、星形细胞瘤及多胶母细胞瘤、转移瘤，往往引起四脑室侧移及前移。后颅凹各种占位性病变都有ＣＴ影像学特征。可依据症状，与四脑室之间的关系，多可准确定位及定性诊断，本文定位诊断符合率为８９．７％。定位诊断准确率提高，可进一步提高定性诊断准确率。
A total of 117 cases of posterior fossa lesions confirmed by operation and pathology were collected, including 114 tumors and 3 cysts. Medulloblastoma, astrocytoma and ependymoma occur in adolescents. Cerebellar pons are well heard of acoustic neuroma, meningioma, cholesteatoma, tend to have lateral ventricular lateral movement and posterior. Cerebellar vermis medulloblastoma, accounting for 82.4%, can cause four ventricle forward. Fourth ventricle benign ependymoma, accounting for 80%, causing four ventricle expansion. Good cerebellar hemispheric hemangioblastoma, astrocytoma and multiple glioblastoma, metastases, often caused by lateral ventricular lateral movement and advancement. All posterior fossa lesions have CT imaging features. According to the symptoms, and the relationship between the four ventricle, more accurate positioning and qualitative diagnosis, positioning diagnosis of this article was 89.7%. Positioning diagnostic accuracy, can further improve the accuracy of qualitative diagnosis.