目的 探讨Fisch法在颅中窝手术入路中如何识别弓状隆起，分析弓状隆起与上半规管的相对位置关系。 方法 选取18~57岁无颞骨岩部占位性病变的受试者60例，其中男女各30例，左右双侧共120个样本，颞骨CT薄层扫描并建立三维坐标系，测量弓状隆起、上半规管的三维坐标值并分析两者的位置关系。 结果 弓状隆起的形态不定，约有15.00%的样本弓状隆起不明显，导致无法定位；弓状隆起与上半规管并非严格对应，约有83.75%的样本弓状隆起位于上半规管的后外侧。 结论 Fisch法进行内耳道手术时，部分样本弓状隆起的识别存在困难；大部分上半规管并不在弓状隆起下方，弓状隆起多位于上半规管的后外侧。
Objective To explore how to locate the internal auditory canal through the middle cranial fossa approach, focus on the identification of the arcuate eminence and the relationship between the arcuate eminence and the superior semicircular canal in Fisch’s method. Methods Sixty subjects aged 18~57 years without space occupying lesions in the petrous part of the temporal bone were selected for bilateral measurement (totaling 120 sides). Among them, half were male and half female. The temporal bone was scanned by CT and the three-dimensional coordinate system was established to measure the three-dimensional coordinate values of the arcuate eminence and the superior semicircular canal. Results The shape of the arcuate eminence was uncertain: about 15% of the samples had no obvious arcuate eminence structure, which led to the inability to locate it. The arcuate eminence did not correspond strictly to the superior semicircular canal. About 83% of the samples had the arcuate eminence located in the posterolateral part of the superior semicircular canal. Conclusion In internal auditory meatus surgery by Fisch's method, there are some difficulties in identification of the arcuate eminence. Most of the superior semicircular canals are not always below the arcuate eminence, but located posterolaterally to the arcuate eminence.
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