Cochlear Fibrosis after Vestibular Schwannoma Resection via the Middle Cranial Fossa Approach.

Publication/Presentation Date

1-1-2022

Abstract

OBJECTIVE: The aim of this study was to determine the incidence of cochlear fibrosis after vestibular schwannoma (VS) resection via middle cranial fossa (MCF) approach.

DESIGN: A retrospective case review was conducted.

SETTING: The review was conducted in a tertiary care academic medical center.

PARTICIPANTS: Patients who (1) underwent resection of VS via MCF approach between 2013 and 2018, (2) had complete pre- and post-audiometric testing, and (3) had clinical follow-up with magnetic resonance imaging (MRI) for at least 1 year after surgery were included.

MAIN OUTCOME MEASURE(S): The main outcome of this study was cochlear fibrosis as assessed by MRI 1 year after surgery.

RESULTS: Fifty-one patients underwent VS resection via MCF technique during the study period. Of 31 patients with AAO-HNS class A or B preoperative hearing ability, 18 (58.0%) maintained class A, B, or C hearing postoperatively. Of 16 patients who lost hearing and had MRI 1 year after surgery, 11 (61.1%) had MRI evidence of fibrosis in at least some portion of the labyrinth and 4 (22.2%) showed evidence of cochlear fibrosis. Of 16 patients with preserved hearing and MRI 1 year after surgery, 4 (25%) had fibrosis in some portion of the labyrinth, with no fibrosis in the cochlea.

CONCLUSIONS: In patients who lose hearing during VS resection with the MCF approach, there is usually MRI evidence of fibrosis in the labyrinth 1 year after surgery. However, there is also, but less commonly, fibrosis involving the cochlea. It is unclear if this will affect the ability to insert a cochlear implant electrode array.

Volume

27

Issue

3

First Page

243

Last Page

248

ISSN

1421-9700

Disciplines

Medicine and Health Sciences

PubMedID

35378528

Department(s)

Department of Surgery, Division of Otolaryngology

Document Type

Article

Link to Full Text

Share

COinS