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Posterior semicircular canal dehiscence: first reported case series
Quinton Gopen1, Guangwei Zhou, Dennis Poe
1Department of Otolaryngology and Communication Enhancement, Children's Hospital Boston, Boston, Massachusetts 02115, USA. Quinton.Gopen@Childrens.Harvard.Edu
Summary
Posterior semicircular canal dehiscence, a third-window lesion, causes hearing loss and vestibular dysfunction. Vestibular evoked myogenic potential testing can confirm this condition, especially in patients with high-riding jugular bulbs.
Area of Science:
- Otolaryngology
- Neuroscience
- Audiology
Background:
- Posterior semicircular canal dehiscence is a rare condition affecting the inner ear.
- It can manifest with diverse audiological and vestibular symptoms.
- Understanding its characteristics is crucial for accurate diagnosis and management.
Purpose of the Study:
- To delineate the clinical, audiological, and vestibular features of posterior semicircular canal dehiscence.
- To characterize associated imaging findings and patient demographics.
- To establish diagnostic criteria and management insights.
Main Methods:
- Retrospective case review of 12 patients diagnosed with posterior semicircular canal dehiscence.
- High-resolution computed tomography (HRCT) for diagnosis confirmation.
- Comprehensive audiological and vestibular evoked myogenic potential (VEMP) testing.
Main Results:
- Mixed hearing loss was most common (9/12 patients).
- Common imaging findings included dehiscence into a high-riding jugular bulb (7/12).
- Vestibular symptoms, particularly chronic disequilibrium, were more prevalent in adults; VEMP testing showed characteristic reduced thresholds and higher amplitudes.
Conclusions:
- Posterior semicircular canal dehiscence is a third-window lesion presenting with hearing loss and vestibular dysfunction.
- HRCT and VEMP testing are key diagnostic tools.
- Patients with high-riding jugular bulbs and hearing loss warrant specific evaluation for posterior canal dehiscence.
