Department of Otolaryngology, Demiroglu Bilim University Hospital, Istanbul, Turkey.
Florence Nightingale Atasehir Hastanesi, Kulak Burun Bogaz Anabilim Dali, Kuçukbakkalkoy Mahallesi, Isiklar Cd. 35/A, 34750, Atasehir/Istanbul, Turkey.
Eur Arch Otorhinolaryngol. 2020 Dec;277(12):3301-3306. doi: 10.1007/s00405-020-06044-1. Epub 2020 May 21.
In this study, we aimed to introduce the facial nerve as a new anatomical landmark which can be used in ossified cochleas during cochlear implantation. We also set out to define a safe line to preserve the internal auditory canal (IAC) while drilling the basal turn of the cochlea.
Thirty patients who had temporal computed tomography (CT) were studied. The distances from the facial nerve and the round window to the IAC, carotid artery, and jugular bulb were measured in the reformatted CT images. We have created a line in the direction of the stapedial tendon from the round window to the IAC and called it ROWIAC (Round window-IAC) line. We have investigated whether this line intersects the IAC and measured the distances from this line to the IAC.
Fifty-four temporal CT scans were included to the study. The mean distances from the facial nerve to the IAC, carotid artery, and jugular bulb were 8.8 ± 0.9, 15.0 ± 2.0, and 12.2 ± 2.9 mm, respectively. The mean distances from the round window to these structures were 3.8 ± 0.7, 9.4 ± 2.2, and 8.3 ± 2.9 mm, respectively. ROWIAC line did not intersect the IAC in any of the patients. The mean distance between this line and the IAC was 0.8 ± 0.4 mm.
We propose that facial nerve and ROWIAC line can be used as potential landmarks during cochlear implantation in ossified cochleas to protect the adjacent neurovascular structures.
本研究旨在介绍面神经作为一种新的解剖学标志，可用于耳硬化症患者的人工耳蜗植入。我们还确定了一条安全的线路，在耳蜗基底部钻孔时保护内听道（IAC）。
对 30 例颞骨 CT 患者进行研究。在重建的 CT 图像上测量面神经和圆窗至 IAC、颈动脉和颈静脉球的距离。我们在圆窗至 IAC 的方向上创建了一条线，称为 ROWIAC（圆窗-IAC）线，并研究了这条线是否与 IAC 相交，以及从这条线到 IAC 的距离。
本研究共纳入 54 例颞骨 CT 扫描。面神经至 IAC、颈动脉和颈静脉球的平均距离分别为 8.8±0.9、15.0±2.0 和 12.2±2.9mm，圆窗至这些结构的平均距离分别为 3.8±0.7、9.4±2.2 和 8.3±2.9mm。在所有患者中，ROWIAC 线均未与 IAC 相交。这条线与 IAC 的平均距离为 0.8±0.4mm。
我们提出面神经和 ROWIAC 线可作为耳硬化症患者人工耳蜗植入时保护相邻神经血管结构的潜在标志。
