Auditory Findings in 33 Cases of Acoustic Neuromas

The audiological findings of 35 ears in 33 cases with surgically confirmed acoustic neuromas were presented. One of 35 affected ears had normal hearing, 17 hearing loss of varying degree, 17 total deafness. Hearing patterns of 18 ears with preserved hearing were divided into 3 types: (1) high tone loss, (2) moderate flat loss, (3) severe flat loss. A clear connection between the degree of hearing loss and tumor size was noted. The larger the size of tumor, the greater the degree of hearing loss. Cochlear type of abnormality was found for the small- or medium-sized tumors, retrocochlear type for medium- or large-sized tumors. The mechanism of hearing loss in acoustic tumors was discussed. In cochlear type of hearing loss, the diagnosis of acoustic tumor should not be excluded.

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