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Updated: Jun 13, 2025
Surgical Treatment of an Endolymphatic Sac Tumor
Published on: May 26, 2023
Long-Term Follow-Up After Translabyrinthine IAC Tumor Removal With Simultaneous Cochlear Implantation
Anselm Joseph Gadenstaetter1, Alice Barbara Auinger1, Matthias Gerlitz
1Department of Otorhinolaryngology-Head and Neck Surgery, Vienna General Hospital, Medical University of Vienna, Vienna, Austria.
Objective:
To evaluate the long-term hearing outcome after translabyrinthine resection of tumors within the internal auditory canal (IAC) with simultaneous cochlear implantation (CI).
Study Design:
Prospective study.
Setting:
Tertiary referral center.
Patients:
Thirty-seven patients with tumors of the IAC undergoing translabyrinthine tumor surgery as a first-line therapy.
Interventions:
Intraoperatively, electrically evoked auditory brainstem response audiometry (eABR) was performed in all patients to assess cochlear nerve (CN) integrity. In case of preserved CN function after tumor removal, CI was subsequently performed. Postoperatively, patients were regularly followed up to evaluate pure-tone hearing as well as speech recognition with a monosyllabic word comprehension test.
Main Outcome Measures:
Postoperative hearing thresholds and word recognition scores.
Results:
Of 37 included patients, 22 (59.46%) had positive eABR responses after tumor removal. Twenty-one of these underwent simultaneous CI directly after tumor surgery and were followed-up for 24.24 ± 19.83 months after surgery. Hearing of these patients significantly improved from 73.87 ± 21.40 dB preoperatively to a mean pure-tone average of 41.56 ± 18.87 dB 1 year ( p = 0.0008) and 34.58 ± 2.92 dB 3 years after surgery ( p = 0.0157). Speech recognition significantly recovered from 13.33 ± 25.41% to 58.93 ± 27.61% 1 year ( p = 0.0012) and 51.67 ± 28.58% 3 years postoperatively ( p = 0.0164).
Conclusions:
Regardless of tumor histopathology, CI is an effective option to restore patients' hearing after translabyrinthine tumor surgery. After CI, patients hearing can be restored over a long-term period of a minimum of 3 years post-surgery. Furthermore, eABR proves to be a practical tool to evaluate CN function and screen for patients eligible for CI.
