慢性中耳炎的HRCT诊断

目的探讨慢性中耳炎的HRCT特征、诊断及鉴别诊断.方法回顾性分析105例慢性中耳炎患者术前临床和HRCT检查资料,并与手术病理结果对照.结果36例胆脂瘤型中耳炎HRCT表现为鼓室或/及鼓窦内团块状软组织影和骨质改变,包括听骨硬化、移位、破坏,盾板破坏及中耳腔扩大,有的还伴有乙状窦、天盖、水平半规管的破坏.69例渗出肉芽型中耳炎HRCT表现多呈斑片状、条索状或网状软组织影,部分可见液平,听骨移位及破坏较轻.结论依据中耳腔内软组织影的分布、形态及骨质改变等特点,大多数慢性中耳炎可籍HRCT做出诊断或鉴别诊断.

HRCT Diagnosis of Chronic Otitis Media

Objective To explore the high-resolusion CT(HRCT)signs,diagnosis and differential diagnosis of chronic otitis media(COM).Methods Clinical and HRCT features of 105 cases were analysed,these cases were proved by surgery.Results HRCT findings of cholesteatoma(36/105) of the middle ear were abnormal soft-tissue shadows in tympanic cavity and antrum and accompany with bony destruction,including dislocation and distruction of the ossicular chain,the erosion of scutum and enlargment of the tympanic cavity and sclerosed bone border.The sigmoid sinus plate,tegmen tympani,semicircular canal and facial nurvus canal were disrupted in severe cases.The granuloexsudative type COM(69/105) usually appeared as patch,steak or net softtissue shadows on HRCT,with slight dislocation and disruption of the bone.Conclusion COM can be dignosed and differentiatioed according to the location and shape and changes of the softtissue shadows in tympanic cavity and bony distruction on HRCT.