1 Department of Otolaryngology-Head and Neck Surgery, University of Kansas, Kansas City, Kansas, USA.
2 Department of Neurosurgery, University of Kansas, Kansas City, Kansas, USA.
Otolaryngol Head Neck Surg. 2018 Jan;158(1):155-157. doi: 10.1177/0194599817733665. Epub 2017 Sep 26.
The presigmoid retrolabyrinthine approach to the cerebellopontine angle is traditionally described to not provide access to the internal auditory canal (IAC). We aimed to evaluate the extent of the IAC that could be exposed with endoscopically assisted drilling and to measure the percentage of the IAC that could be visualized with the microscope and various endoscopes after drilling had been completed. Presigmoid retrolabyrinthine approaches were performed bilaterally on 4 fresh cadaveric heads. We performed endoscopically assisted drilling to expose the fundus of the IAC, which resulted in exposure of the entire IAC in 8 of 8 temporal bone specimens. The microscope afforded a mean view of 83% (n = 8) of the IAC. The 0°, 30°, 45°, and 70° endoscope each afforded a view of 100% of the IAC in 8 of 8 temporal bone specimens. In conclusion, endoscopic drilling of the IAC of can provide an extradural means of exposing the entire length of the IAC while preserving the labyrinth.
经乙状窦后入路传统上被认为无法到达内听道（IAC）。我们旨在评估经内镜辅助钻孔后可暴露的 IAC 范围，并测量钻孔完成后显微镜和各种内镜可观察到的 IAC 百分比。我们在 4 个新鲜的尸体头颅上双侧进行了经乙状窦后入路。我们进行了内镜辅助钻孔以暴露 IAC 底部，结果 8 个颞骨标本中均完全暴露了整个 IAC。显微镜平均可观察到 83%（n=8）的 IAC。0°、30°、45°和 70°内镜在 8 个颞骨标本中均可观察到 100%的 IAC。总之，内镜钻磨 IAC 可提供一种硬膜外方法来暴露整个 IAC 长度，同时保留迷路。
