Hearing in patients with congenital deformity of the inner ear.

Congenital abnormalities of the bony labyrinth and internal auditory meatus range from complete absence to minor anomalies compatible with normal cochlea function. A 'follow-up' survey to assess the hearing of 56 patients with abnormalities of the inner ear shown by tomography was made. The hearing levels are discussed in relation to the tomographic appearances and comparison made with other series of inner ear abnormalities demonstrated both radiographically and histologically.