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Imaging findings of cochlear nerve deficiency
Christine M Glastonbury1, H Christian Davidson, H Ric Harnsberger
1Department of Radiology, University Hospital, Salt Lake City, UT, USA.
AJNR. American Journal of Neuroradiology
|April 16, 2002
Summary
Cochlear nerve deficiency, a cause of sensorineural hearing loss (SNHL), is detectable with high-resolution MRI. This finding is crucial for diagnosing congenital SNHL and assessing patients for cochlear implantation.
Area of Science:
- Radiology
- Neuroimaging
- Otolaryngology
Background:
- High-resolution T2-weighted fast spin-echo MRI effectively visualizes cranial nerves within the internal auditory canal.
- Cochlear nerve deficiency is linked to congenital sensorineural hearing loss (SNHL).
- Assessing cochlear nerve integrity is vital for diagnosing and managing SNHL.
Purpose of the Study:
- To evaluate the utility of high-resolution T2-weighted fast spin-echo MRI in depicting cochlear nerve deficiency.
- To correlate cochlear nerve deficiency with congenital and acquired SNHL.
- To identify imaging markers associated with cochlear nerve deficiency.
Main Methods:
- Retrospective review of high-resolution T2-weighted fast spin-echo MRI scans from 22 patients with cochlear nerve deficiency.
- Evaluation of cochlear nerve size, internal auditory canal (IAC) dimensions, and inner ear abnormalities.
- Correlation of imaging findings with clinical history, examination, and audiometric data.
Main Results:
- Cochlear nerve deficiency was identified in 22 patients, with 12 having congenital SNHL and 10 having acquired SNHL.
- Internal auditory canal (IAC) hypoplasia was present in 11 of 12 patients with congenital cochlear nerve deficiency.
- Cochlear nerve deficiency was associated with acoustic schwannoma (2 cases) and acquired labyrinthine abnormalities (7 cases).
Conclusions:
- High-resolution T2-weighted fast spin-echo MRI is effective in demonstrating cochlear nerve deficiency.
- Cochlear nerve deficiency can occur in both congenital and acquired SNHL and is important for cochlear implant candidacy assessment.
- Internal auditory canal (IAC) hypoplasia serves as an indicator of congenital cochlear nerve deficiency.