Vol. 95 No. 1 January 2002

Bilateral Dilatation of the Internal Auditory Canal with Progressive
Hearing Loss and Other Complications                                                 

Masako Miura, Hiroaki Shimogori, Tomoko Nakano,
Hiroshi Yamashita and Shiro Kashiwagi                     
(Yamaguchi University)

       A case of bilateral dilatation of the internal auditory canal without acoustic tumors, which was the so-called patulous internal auditory canal, is reported. The patient was a 12-year-old boy with bilateral sensorineural hearing loss, canal paresis in the left ear, anal atresia, epilepsy, mental retardation, and A-V block.
       Radiographs showed that the maximum diameter of the internal auditory canal was 12.8mm on the left and 16.3mm on the right. CT and MRI showed no evidence of an intracanalicular mass. Diffusion-weighted imaging was useful for a definitive diagnosis. No epidermoid cyst was present in the internal auditory canal.

Key words : patulous canal, internal auditory canal, diffusion-weighted imaging


第95巻1号 目次   Vol.95 No.1 contents