早期获得性中耳小胆脂瘤的HRCT表现

HRCT findings of acquired small cholesteatoma in the middle ear of early stage

目的:探讨各向同性下获得性中耳小胆脂瘤的HRCT表现特点。方法:回顾性分析获得性中耳小胆脂瘤39耳,均采用各向同性扫描及多向调整MPR技术进行显示。结果:获得性中耳小胆脂瘤的HRCT表现可分为3型:鼓室回缩囊4耳,松弛部胆脂瘤27耳,紧张部胆脂瘤8耳。结论:①鼓室回缩囊表现为边缘不光滑的含气腔,是未形成实性胆脂瘤前的表现形式;②松弛部胆脂瘤位于上鼓室前外壁,造成听骨链向内移位,骨质破坏以锤骨和鼓室盾板为主;③紧张部胆脂瘤位于鼓室下后壁,造成听骨链向外侧移位,骨质破坏以砧骨长脚和鼓室窦为主。

Objective： To study the HRCT findings of acquired small cholesteatoma in the middle ear by the ways of isotrophic scan. Methods： Thirty-nine cases of acquired small cholesteatoma in the middle ear were analyzed retrospectively. All the cases were processed by isotrophic scan and displayed MPR technique. Results： HRCT findings of acquired small cholesteatoma were classified into three types：4 cases of tympanic retraction pockets,27 cases of flaccid part cholesteatomas, 8 cases of tense part cholesteatomas. Conclusion： （1） Retraction pockets appeared as airregulua rim aerated cavities, which were the findings before solid eholesteatomas;（2） Flaccid part cholesteatomas were located in the anterior-lateral wall in epitympanum,which caused ossicular chains displace internally. Bone destructions mainly located in malleus and scutum;（3） Tense part cholesteatornas were lo cared in posterior-inferior wall, which caused ossicular chains displace laterally,bone destructions mainly located in long process of incus and tympanic sinus.