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Hearing Restoration During Vestibular Schwannoma Surgery With Transcanal Approach

Anatomical and Functional Preliminary Report

Marchioni, Daniele*; Veronese, Sheila*; Carner, Marco*; Sacchetto, Andrea*; Sacchetto, Luca*; Masotto, Barbara; Bianconi, Luca*

doi: 10.1097/MAO.0000000000001980
TUMORS OF THE EAR AND CRANIAL BASE

Objective: Hearing restoration has always been a dream in vestibular schwannoma (VS) surgery. The aim of this study is to describe an endoscopic assisted transcanal retrocochlear approach to the internal auditory canal (IAC) with total removal of the VS; simultaneously we assessed the anatomical and functional aspects of hearing restoration with cochlear implant (CI).

Study Design: A retrospective case series.

Setting: Tertiary referral center.

Patients: Six patients affected by VS involving the fundus of the IAC (Koos stage I–II) were included in this study. The patients already demonstrated symptoms of IAC involvement by the neuroma, with severe to profound hearing loss.

Interventions: Transcanal microscopic, endoscopic assisted, approach was chosen for total tumor removal. Preoperative and intraoperative electrophysiological monitoring was performed using electrically evoked auditory brainstem responses (EABR) to evaluate preservation of cochlear function.

Main Outcome and Measures: A retrospective evaluation of electrophysiological data collected during surgeries has been conducted; clinical outcomes, surgical complications, and postoperative radiological evaluations were also considered.

Results: Total tumor removal was achieved in all patients with no major complications. One patient showed temporary facial palsy (HB stage II). We were able to preserve cochlear function in five out of six patients. In those patients intraoperative monitoring with EABR was performed after tumor removal with good responses.

Conclusions: Transcanal retrocochlear approach for VS removal allows preservation of cochlea and cochlear nerve function. This is the first step towards developing an effective surgical technique for VS removal and hearing rehabilitation with CI.

*Section of Otolaryngology

Section of Neurosurgery, Department of Neurosurgery, University of Verona, Verona, Italy

Address correspondence and reprint requests to Andrea Sacchetto, M.D., Section of Otolaryngology, University of Verona, Verona, Italy; E-mail: andrea.sacchetto89@gmail.com

Disclosure: All of the authors have read and approved the manuscript, and none of them have any financial relationships to disclose.

The authors disclose no conflicts of interest.

Copyright © 2018 by Otology & Neurotology, Inc. Image copyright © 2010 Wolters Kluwer Health/Anatomical Chart Company