Cystic acoustic neurinomas--report of two cases.

Two cases of large, cystic acoustic neurinoma are described. On computed tomographic scans, cystic acoustic neurinomas resemble, and may be confused with, other tumors of the cerebellopontine angle. A cystic acoustic neurinoma should be considered in the event of a large, cystic cerebellopontine angle tumor, especially if there is no significant hearing loss and no destruction of the internal auditory canal.