In our series, the sensitivity of HRCT scan to otosclerosis was 95.1%. Hypodense otosclerotic foci were mostly localized at the anterior part of footplate. Negative or doubtful cases were associated with the highest incidence of stapes footplate complications. Foci involving otic capsule, internal auditory canal, or round window led to a significantly higher risk of sensorineural hearing loss.
This is the largest series of reported coexistence of STD and SCCD in the literature. Protrusion of the superior semicircular canal in the middle cranial fossa is probably an additional factor underlying STD and SCCD etiopathogeny. Semicircular canal dehiscence should always be looked for when STD is present.
Of 487 cochlear implantations, 3.8% of adults and 4.5% of children underwent a revision surgery. The mean time to device failure was 7.6 years in children and 1.5 year in adults. Causes of revision were seven hard failures, four soft failures, and nine medical reasons. Among the medical reasons, four patients had skin flap infection associated with an extended endaural approach. Audiologic performances were stable or improved following reimplantation in 90% of cases. We had two cases of electrode array misplaced into the vestibular system.
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