Background: Detailed investigations of the stapedial muscle (SM) in congenital aural atresia (CAA) patients have yet to be adequately conducted. Objectives: To assess image variations in the mastoid segment of the facial nerve (FN) and SM in CAA. Materials and methods: A total of nine patients comprising of 9 ears with unilateral CAA were studied. The courses of the FN and SM were evaluated from the basic point to 1 mm intervals between the mastoid portion of FN, and measured from the mean X and Y values in each group. Results: The atresia side of FN among the Y values showed significant differences compared to the contralateral side. In terms of the SM, there were no significant differences in both the X and Y values. The stapedial muscle of the CAA patients was located medially to the FN. Conversely, the distance from the PSC to the FN revealed no significant differences with regard to the X and Y values for each group. Conclusion: The current observations revealed that the SM is located more posterior to the FN in CAA patients, and this is mainly attributed to the laterally and anteriorly displaced FN.
背景:对先天性耳道闭锁(CAA)患者进行镫骨肌(SM)的详细研究尚待充分开展。 目的:探讨CAA患者的面神经乳突段(FN)和SM的影像变化。 材料与方法:对9例9耳单侧CAA患者的临床资料进行分析。FN和SM的病程从FN乳突部之间的基点到1 mm的间隔进行评估, 并根据每组的平均X和Y值进行测量。 结果:Y值中FN闭锁侧与对侧相比, 有显著性差异。至于SM, X和Y值均无显著差异。CAA患者的镫骨肌位于FN的内侧。相反, 从PSC到FN的距离显示, 各组的X和Y值没有显著差异。 结论:目前的研究显示, CAA患者的SM位于FN后方, 这主要是由于FN侧向和向前移位所致。