![]() ![]() In this study, we built upon Doctor HousE′s proposed method for localization of the IAC. In 1963, William House performed surgery in the IAC via the middle cranial fossa. The latter approach fully exposes the bottom and lateral parts of the internal auditory canal (IAC) during surgery, enabling visualization of the facial and auditory nerves during the removal of acoustic neuromas and preserving facial nerve function. These methods include the retrosigmoid sinus approach, the translabyrinthine approach, and the middle cranial fossa approach. However, the angle typically ranged from 10–30° in our study.Įxperts around the world have explored different surgical approaches to remove acoustic neuromas, preserving facial nerve function. The angle between the SSC and the IAC ranged from 0° to 60° degrees, as reported previously by Fisch. The arcuate eminence did not correspond directly with the SSC, as the former was located posterolateral to the latter in 85.83% of samples. ConclusionsĪnalysis samples showed that the SSC was located in a fan ring centered at the midpoint of the upper edge of the petrous portion of the temporal bone. The arcuate eminence was difficult to identify in 37 samples. Approximately 23.12% of samples had no obvious arcuate eminence, which prevented the use of Fisch’s method to localize the SSC. The results showed that the shape of the arcuate eminence is highly variable. The temporal bone in these 160 samples was scanned using computed tomography, and a three-dimensional coordinate system was established to measure the three-dimensional coordinate values of structures adjacent to the arcuate eminence, the SSC, and the IAC. ![]() In total, 160 samples were obtained from both sides of the temporal bone. Methodsįorty men and 40 women (18–57 years of age) without space-occupying lesions in the petrous part of the temporal bone were selected for the study. This study was designed to address the technical difficulties encountered in recognizing and localizing the arcuate eminence with respect to the superior semicircular canal (SSC). The Fisch infra-temporal fossa approach (Fisch’s method), first proposed in 1970, is commonly used during internal auditory canal (IAC) surgery with an approach that advances through the middle cranial fossa. ![]()
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