Table 4.
Prevalence of radiographic sites of dehiscence in 502 temporal bones associated with third window syndrome in 401 patients (802 temporal bones).
| Location(s)/Site(s) | Prevalence (%) |
|---|---|
| Superior semicircular canal dehiscence | 175/502 (34.9%) |
| Near-superior semicircular canal dehiscence | 121/502 (24.1%) |
| CT– third window syndrome | 97/502 (19.3%) |
| Cochlea-facial nerve dehiscence | 52/502 (10.4%) |
| Superior semicircular canal dehiscence + Cochlea-facial nerve dehiscence | 30/502 (5.98%) |
| Cochlea-internal auditory canal dehiscence | 5/502 (1.0%) |
| Cochlea-internal auditory canal dehiscence + Cochlea-facial nerve dehiscence | 4/502 (0.8%) |
| Lateral semicircular canal dehiscence | 3/502 (0.6%) |
| Wide vestibular aqueduct | 3/502 (0.6%) |
| Wide vestibular aqueduct + Cochlea-facial nerve dehiscence | 2/502 (0.4%) |
| Posterior semicircular canal dehiscence | 2/502 (0.4%) |
| Superior semicircular canal-Superior petrosal sinus dehiscence | 2/502 (0.4%) |
| Superior semicircular canal dehiscence + Posterior semicircular canal dehiscence + Wide vestibular aqueduct | 1/502 (0.2%) |
| Superior semicircular canal-Subarcuate artery dehiscence | 1/502 (0.2%) |
| Superior semicircular canal dehiscence + Cochlea-internal auditory canal dehiscence | 1/502 (0.2%) |
| Superior semicircular canal dehiscence + Posterior semicircular canal dehiscence | 1/502 (0.2%) |
| Posterior semicircular canal-Jugular bulb dehiscence | 1/502 (0.2%) |
| Modiolus | 1/502 (0.2%) |
CT–, High-Resolution Temporal Bone Computed Tomography Scan Negative for a Visible Site of Dehiscence.