#Internal auditory meatus how to

Radiological evaluation: High-resolution computed tomography (CT) of the temporal bone in sagittal view uncovers the right double-barreled internal auditory canal and normal internal auditory canal on the left side. The tuning fork test showed a false-negative Rinne's on the right side and positive on the left side with the weber lateralized to the left ear. Otoscopic examination showed bilateral tympanic membranes intact. He had no significant family history of hearing loss. His birth and developmental history were normal. He had no history of ear discharge, dizziness, or facial asymmetry. He noticed right ear hard of hearing while using his headphones.

The inferior contents of internal auditory canal, the cochlear and the inferior vestibular nerve were hypoplastic due to the duplication of internal auditory canal.Īn 11-year-old boy presented with a right-sided hearing loss for 6 months. This case is of a unilateral double-barreled internal auditory canal with severe sensorineural hearing loss, which has not been reported in the literature so far. The management of hypoplastic cochlear nerve would be a cochlear implant, but in case of an aplastic nerve cochlear implant would not be beneficial. Patients with stenotic internal auditory canal have dysplastic cochlear and vestibular nerve, whereas duplicated internal auditory canal will have aplasia of cochlear and inferior vestibular nerve. The duplicated internal auditory canal is frequently misdiagnosed as internal auditory canal stenosis. The normal diameter of internal auditory meatus is 2–8 mm, and in stenosis, it is <2 mm. Congenital sensorineural hearing loss associated with inner ear anomalies is 20% more common with internal auditory meatus stenosis. Available from: ĭuplication of the internal auditory canal is a very rare congenital disorder of temporal bone which is usually bilateral, associated with cochlear and inferior vestibular nerve hypoplasia. Unilateral double-barreled internal auditory meatus with severe sensorineural hearing loss: A diagnostic challenge.

#Internal auditory meatus how to

How to cite this URL: Selvarajan G, Vaishnavi R, Prateep MA, Jeevanandham B. How to cite this article: Selvarajan G, Vaishnavi R, Prateep MA, Jeevanandham B. Keywords: Cochlear nerve hypoplasia, inferior vestibular nerve hypoplasia, internal auditory meatus duplication, magnetic resonance imaging We report a very rare case of unilateral double-barreled internal auditory meatus with severe sensorineural hearing loss without any inner ear anomalies in an adolescent, being benefited with an air conduction hearing aid. All of them being bilateral duplication or narrowing of internal auditory meatus with profound sensorineural hearing loss.

Internal auditory meatus duplication is an exceedingly rare temporal bone anomaly.