Otosclerosis and anterior semicircular canal dehiscence: A case report

Otosclerosis is an osteodystrophy of the temporal bone. Its pathophysiology consists of osseous remodeling of the otic capsule, primarily causing conductive hearing loss. Treatment usually includes stapes surgery and, in some cases, the fitting of conventional hearing aids. This case report describes the coexistence of otosclerosis with anterior semicircular canal dehiscence (ASCD). A 45-year-old female patient was referred to the ENT specialist for bilateral hearing loss with a 5-year history. The combined findings from the pure tone audiometry, acoustic impedance, and high-resolution computed tomography scan established the simultaneous diagnosis of otosclerosis and ASCD in both ears. Due to the potential complications associated with stapes surgery when otosclerosis coexists with an ASCD, the patient was fitted with a hearing aid which provided no functional gain. For this reason, a bone conduction implant, the OSIA® system, was subsequently placed in the left ear uneventfully, resulting in hearing improvement.