Prevalence of otic capsule dehiscence in temporal bone computed tomography scan

Purpose To investigate the radiologic prevalence of otic capsule dehiscence in temporal bone computed tomography (CT) scan. Methods This was a cross-sectional study. The temporal bone CT scans of the patients presenting to a tertiary center were evaluated for possible dehiscence in any part of the otic capsule; then, all of the dehiscence were confirmed by a trained academic radiologist. For each type of otic capsule dehiscence, at least three planes were used with a specific type of reconstruction. When a dehiscence was present in at least two consecutive images in all planes, it was considered as a true dehiscence. Results Six hundred patients (mean age: 40 +/- 18.1 years) were enrolled. The prevalence of superior and posterior semicircular canal dehiscence was 6.0% and 2.7%, respectively. The prevalence of cochlear-facial dehiscence, cochlear-internal auditory canal dehiscence, and cochlear-carotid dehiscence was 6.3%, 0.7%, and 0.7%, respectively. The prevalence of vestibular aqueduct-jugular bulb dehiscence was 6.3% and the prevalence of posterior semicircular canal-jugular bulb dehiscence was 0.2%. Conclusions Considering different types of otic capsule dehiscence described, care should be taken in patients with vestibular and auditory signs and symptoms to diagnose these dehiscences.

Automated summary

The radiologic prevalence of otic capsule dehiscence in temporal bone CT scans was investigated in this study. The prevalence varied among different types of dehiscence, highlighting the importance of diagnosing these conditions in patients with vestibular and auditory symptoms.