慢性中耳炎的HRCT诊断

探讨慢性中耳炎的ＨＲＣＴ征象，诊断及鉴别诊断。材料与方法；对手术证实的１７例慢性中耳炎患者术前进行ＨＲＣＴ扫描并与手术病理结果对照分析。结果；胆脂瘤８例表现为中耳腔内团块状影，周围低密度环包绕，听骨明显破坏及鬓 扩大，骨缘硬化。４例肉芽肿多呈片状，条索状或网状，听骨破坏较轻。

HRCT Diagnosis of Chronic Tympanitis

Objective: To study the high resolution CT (HRCT) features, diagnosis and differential diagnosis of chronic tympanitis.Materials and Methods:The HRCT features of 17 cases of chronic tympanitis proved by surgery were studied and compared with the surgical and pathology findings.Results:The lesion of cholesteatoma (8/17) appeared as mass shadows in tympanic sinusand and cavity with low denisty ring around, accompanied with obvious ossicles chain destruction. And enlargement of the tympanic sinus and cavity, whose bone borders were sclerosing. However, granuloma usually appeared as patch, streak or net on HRCT, with slight ossicles chain destruction and slight bone erosion.Conclusion: Based on the HRCT features mentioned above, not their density changes most cases of chornic tympanitis can be diagnosed and differentiatied between cholesteatoma and granuloma by HRCT.