Intralabyrinthine schwannoma.

In the case presented, an intralabyrinthine schwannoma was discovered during translabyrinthine eighth nerve section. Analysis of this case and the 22 previously reported cases of intralabyrinthine schwannoma highlights the difficulty in preoperative diagnosis of this lesion. Concerns are raised about the frequency with which this diagnosis may be missed and its implication in neurotologic surgery for vertigo.