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Updated: Jun 21, 2026
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In Vivo Morphometric Analysis of Human Cranial Nerves Using Magnetic Resonance Imaging in Menière's Disease Ears and Normal Hearing Ears
Published on: February 21, 2018
Cochlear nerve diameter in normal hearing ears using high-resolution magnetic resonance imaging.
Eric M Jaryszak1, Nimish A Patel, Morgan Camp
1Department of Otolaryngology, University of Florida, 1600 SW Archer Road, Gainesville, FL 32610-0264, USA. Eric.Jaryszak@ent.ufl.edu
The Laryngoscope
|August 4, 2009
Summary
Cochlear nerve (CN) diameter can be reliably measured using MRI, establishing normative data. This aids in evaluating sensorineural hearing loss and predicting treatment outcomes for better cochlear implant performance.
Area of Science:
- Radiology
- Neuroscience
- Otolaryngology
Background:
- Deficient cochlear nerves (CN) are linked to poor cochlear implant outcomes.
- Radiographic normative data for CN diameter is currently lacking.
Purpose of the Study:
- To assess the reproducibility of measuring CN diameter via CISS-sequence MRI.
- To establish normative radiographic ranges for CN diameter.
Main Methods:
- Retrospective MRI review by two blinded observers.
- Measurement of CN diameter and cross-sectional area at the internal auditory canal (IAC) fundus.
- Evaluation of interobserver agreement.
Main Results:
- The CN was identifiable in 100% of ears.
- CN diameter was measurable in 93% of ears.
- Normative data: vertical diameter (1.4 mm), horizontal diameter (1.0 mm), cross-sectional area (1.1 mm²).
- Good interobserver correlation was observed.
Conclusions:
- CN diameter measurement at the IAC fundus is reliable using MRI.
- This study provides normative radiographic data for CN diameter.
- These findings can aid in diagnosing sensorineural hearing loss and predicting treatment prognosis.
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