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Prevalence of occult cochlear basal turn patency
Varun V Varadarajan1, Orrin L Dayton2, Reordan O De Jesus2
1Department of Otolaryngology, University of Florida, Gainesville, FL, USA.
Acta Oto-Laryngologica
|August 18, 2020
Summary
Subtle openings between the cochlea and internal auditory canal (IAC) are common on CT scans. However, openings wider than 0.75 mm, a risk factor for perilymph gusher (PLG), are rare.
Area of Science:
- Otolaryngology
- Radiology
- Neurosurgery
Background:
- Perilymph gusher (PLG) is a rare otologic surgery complication.
- It results from a cochlea-internal auditory canal (IAC) communication.
- Defects > 0.75 mm between the cochlear basal turn and IAC are a known risk factor.
Purpose of the Study:
- To determine the prevalence of radiographic cochlear basal turn patency.
- To assess the frequency of potential perilymph gusher risk factors on CT scans.
Main Methods:
- Included patients with normal temporal bone CT scans.
- An otologist and radiologist independently measured defects.
- Measurements were taken along the cochlea-IAC interface in an oblique plane.
Main Results:
- 210 ears were analyzed.
- 71 ears (33.8%) showed radiographic patency.
- The mean defect width was 0.41 mm (0.15-0.7 mm).
- No defects exceeded 0.75 mm.
Conclusions:
- Radiographic patency of the cochlear basal turn is relatively common.
- Patency > 0.75 mm, a risk for PLG, was not observed in this study.
- The risk for PLG due to cochlear-IAC patency appears rare.
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