【摘要】 目的：评价ＣＴ对中耳胆脂瘤的诊断价值。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。结果：在ＣＴ上显示的中耳胆脂瘤的病理改变为：（１）中耳窦腔内瘤影；（２）瘤周围低密度圈；（３）中耳窦腔骨缘模糊、硬化；（４）中耳窦腔，特别是鼓窦入口扩大；（５）听小骨链破坏。在常规分层片中上述征象显示率明显为低。结论：ＣＴ对中耳胆脂瘤的诊断价值明显优于常规检查，且能为手术提供有益而详细的解剖资料。更多还原

【Abstract】 Purpose: To evaluate the value of CT scan in diagnosing tympanic cholesteatoma. 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.Results: The pathological changes of the tympanic cholesteatoma which could be shown on CT scan include. (1) tumor shadows in the tympanic sinus and cavity. (2) low density ring around the tumor. (3) blurring and sclerosing of the bony borders of tympanic sinus and cavity. (4) enlargement of the tympanic sinus and cavity, especially the entrance of antrum. (5) destruction of the auditory ossicles chain. The demonstrable rate of the above finding is much lower on conventional tomography. Conclnsion: The diagnostic value of CT scan is distinctly superior to conventional technique in diagnosing tympanic cholesteatoma, and also can offer detailed anatomical information helpful for the surgery.更多还原