Otosclerosis is a disorder of the bony labyrinth with usual onset in the third decade. The disease is bilateral in a majority of cases and such patients have conductive hearing loss. In case of fenestral otosclerosis hypodense foci are seen on CT/CBCT just anterior to the oval window, at the so-called fissula ante fenestram region. In case of retrofenestral otosclerosis additional foci are seen in the otic capsule around the cochlea.
KeywordsHearing Loss Osteogenesis Imperfecta Sensorineural Hearing Loss Round Window Internal Auditory Canal
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