Analysis of CT findings with audiometric correlation in patients with otosclerosis

Abstract

It has been reported that an otospongiotic lesion in otosclerosis can be shown as a density-lossarea in computed tomography (CT) of the temporal bone in patients with otosclerosis. Using CT, we evaluated the presence of otospongiotic lesion in 42 ears with otosclerosis and analyzed the relationshipbetween CT and audiometric findings. We found otospongiotic lesions in 21 ears (50%).Bone conduction thresholds were significantly increased in ears with otospongiotic lesions comparedto those without. No significant difference was observed in bone conduction thresholds betweenears with lesions around the cochlea and ears with lesions anterior to the vestibule. It suggests thatactive lesions detected on CT may be more readily cause sensorineural deafness.