Materials and Methods: To analyse the findings on CT scan and that on conventional tomography in 13 cases with tympanic cholesteatoma proved by mastoidotympanectomy, and to compare the demonstrable rates of the above findings on both techniques with that revealed pathologically respectively. 材料和方法:分析经乳突根治术证实的13例中耳胆脂瘤CT及常规分层片上所见征象,并分别与病理对照各征象的显示率。