本文旨在鉴定CT对后颅凹占位病变的部位、大小和性质的确诊程度以及根据其检查结果是否足以确诊和设计最安全的手术途径,最后在CT检查基础上提出常规神经x线检查的指征。作者曾用CT检查6000名病人,其中224例为后颅凹占位病变。结果未发现有真正的假阳性或假阴性,只在未用增强法时曾有过漏诊,故现只在CT所作的术前检查资料不全时,始加作常规的损伤性 This article aims to identify the CT diagnosis of the position, size and nature of the posterior fossa lesion, and whether the results of the examination are sufficient to diagnose and design the safest surgical route. Finally, a conventional nerve x-ray examination is proposed based on the CT examination. Indications. The author used CT to examine 6,000 patients, of whom 224 were posterior fossa lesions. No false positives or false negatives were found in the results. There was a missed diagnosis only when the enhancement method was not used. Therefore, only when the preoperative examination data made by CT were incomplete, the routine injury was added.