Quantitative imaging analysis of transcanal endoscopic Infracochlear approach to the internal auditory canal

Purpose: A transcanal endoscopic infracochlear surgical approach to the internal auditory canal (IAC) in a human temporal bone model has previously been described. However, the proportion of patients with favorable anatomy for this novel surgical technique remains unknown. Herein, we perform a quantitative analysis of the transcanal endoscopic infracochlear corridor to the IAC based on computed tomography. Materials and methods: High resolution computed tomography scans of adult temporal bones were measured to determine the accessibility of the IAC when using an endoscopic transcanal, cochlear-sparing surgical corridor. Results: This approach to the IAC was feasible in 92% (35 of 38) specimens based on a minimum distance of 3 mm between the basilar turn of the cochlear and the great vessels (jugular bulb and carotid artery). Conclusions: Infracochlear access to the IAC is feasible in the majority of adult temporal bones and has implications for future hearing preservation drug delivery approaches to the IAC. (C) 2017 Elsevier Inc. All rights reserved.