Korean J Audiol.  2012 Dec;16(3):141-144. 10.7874/kja.2012.16.3.141.

A Case with the Bilateral Narrow Bony Cochlear Nerve Canals Associated with Near Normal Hearing Thresholds

Affiliations
  • 1Department of Otorhinolaryngology-Head & Neck Surgery, Seoul National University Hospital, Seoul, Korea.
  • 2Department of Otorhinolaryngology-Head & Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Korea. choiby@snubh.org

Abstract

The narrow bony cochlear nerve canal in high resolution temporal bone computed tomography is frequently found in patients of congenital sensorineural hearing loss. But this bony structural anomaly could not conclude the functional outcome of cochlear nerve. Here, we present a case of a 14-month-old girl having bilateral narrow bony cochlear nerve canals. In magnetic resonance imaging, both the cochlear nerves were identified to be intact. Moreover, acoustic brainstem response threshold and auditory steady state response revealed nearly normal hearing thresholds. Therefore, we suggest that the narrow bony cochlear nerve canal itself does not necessarily indicate a substantial degree of hearing loss.

Keyword

Cochlear nerve; Multidetector computed tomography; Sensorineural hearing loss; Magnetic resonance imaging

MeSH Terms

Acoustics
Brain Stem
Cochlear Nerve
Hearing
Hearing Loss
Hearing Loss, Sensorineural
Humans
Magnetic Resonance Imaging
Multidetector Computed Tomography
Temporal Bone
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