先天性骨性外耳道畸形的HRCT影像分析

目的分析81耳骨性外耳道畸形的HRCT表现,探讨颞骨鼓部的发育情况与外耳道畸形的关系.方法收集临床及HRCT证实外耳畸形病例81耳,观察颞骨鼓部的发育情况及相邻结构的改变.结果骨性外耳道轻度发育不良20耳(20/81),表现为鼓部形成外耳道结构,但鼓部发育短小、骨性外耳道狭窄或走行异常;外耳道重度发育不良21耳(21/81),表现为鼓部为一骨块,未形成管形外耳道结构;骨性外耳道缺如40耳(40/81),表现为鼓部结构缺如.结论颞骨鼓部是构成骨性外耳道结构的重要部分,鼓部的发育情况对外耳道畸形的分类具有重要意义.

High-resolution CT diagnosis of the temporal bone in patients with external auditory canal malformation

Objective To analyze HRCT findings of patients with external auditory canal malformation,and evaluate the relationship between development of the tympanic part of temporal bone and the external auditory canal malformation.Methods We reviewed HRCT findings of 81 ears with external auditory canal malformation.Results Mild dysplasia of external auditory canal was seen in 20 ears,in which the tympanic part was small and short with/without external auditory canal stenosis. Severe dysplasia of external auditory canal was seen in 21 ears,in which the tympanic part showed bony mass instead of U-shaped structure. Aplasia of tympanic part with absence of bony external auditory canal was found in 40 ears.Conclusion The tympanic part is the main portion of bony external auditory canal and the development condition of tympanic part should be regarded when we undertake the classification of the external auditory canal malformation.