Auditory Nerve Integrity after Translabyrinthine Acoustic Tumor Removal

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  • 経迷路的聴神経腫よう手術症例におけるか牛神経機能の検討

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Abstract

Fourteen patients underwent translabyrynthine approach for unilateral acoustic tumor (AT) resection with the auditory nerve preservation. Electrical stimulation test (EST) and electrically evoked auditory brainstem response (EABR) were performed to evaluate the postoperative auditory nerve function. Four (29%) of 14 patients retained the functional integrity of the auditory nerve after translabyrinthine AT removal. The average tumor size in maximum was significantly smaller in the group with a positive response to EST or EABR than in the group with a negative response to EST. It seems to be difficult to preserve auditory nerve function in cases with a tumor extending to the fundus of internal auditory canal. These results suggest that size of tumor and/or extension of tumor to the fundus are critically important factors to preserve the auditory nerve function using a translabyrynthine approach.

Journal

  • Otology Japan

    Otology Japan 13 (5), 633-636, 2003

    Japan Otological Society

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