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Skull base surgery. 2000; 10(2): 87–88.
PMCID: PMC1656758

Cochlear Schwannomas


Schwannomas arising solely from the cochlear nerve and limited to the internal auditory canal are rare. Only three prior cases have been specifically described in the literature. We report a 38-year-old male with and asymmetric audiogram and poor discrimination. Magnetic resonance imaging revealed a 3-mm mass occupying the inferior portion of the internal auditory canal. Discrimination improved following a course of steroids, but thresholds did not. The patient underwent a translabyrinthine removal of the tumor, which was confirmed to involve only the cochlear nerve. It is important to obtain evidence regarding the possibility that a tumor confined to the internal auditory canal is a cochlear schwannoma. If so, surgery can be deferred until hearing is no longer functional or tumor growth mandates removal.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Thomsen J, Jorgensen MB. Undiagnosed acoustic neurinomas. A presentation of 4 cases. Arch Klin Exp Ohren Nasen Kehlkopfheilkd. 1973 Oct 12;204(3):175–182. [PubMed]
  • Ayani N, Shea JJ. Asymptomatic schwannoma of the cochlear nerve. Arch Otolaryngol. 1982 Aug;108(8):501–503. [PubMed]

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