The Prevalence of Cochlear Obliteration After Labyrinthectomy Using Magnetic Resonance Imaging and the Implications for Cochlear Implantation

Abstract

Objectives: The aim of this study was to determine the prevalence of cochlear obliteration after labyrinthectomy.

Study design: Retrospective review of medical records.

Setting: Tertiary referral center.

Patients: Sixty-five patients who had previously undergone resection of an acoustic neuroma through a translabyrinthine approach.

Intervention: The magnetic resonance studies were analyzed as part of the routine surveillance after tumor resection.

Main outcome measure: To determine whether the cochlear lumen remained fluid filled.

Results: Sixty-five cochleas were examined. Forty-four cochleas were patent and, of the remaining 21, 9 were obliterated and 12 were partially obliterated. The average length of follow-up for the patent, partially obliterated, and obliterated cochlea groups was 47, 29, and 77 months, respectively.

Conclusion: Obliteration of the cochlea, either partially or completely, occurs in approximately one-third of patients. Time elapsed after labyrinthectomy did not seem to be a predictor of cochlear obliteration.