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Background and Objectives:With advances in techniques in the field of otology, we can now offer better treatment to patients with the conductive hearing loss. Otosclerosis is rare in the mongoloids so the diagnosis and treatment modality are (HRCT) of patients with otsc-lerosis who were confirmed through explotympanotomy and found that there were specific radiological finding relevant to otsclerosis. The purpose of this study was to understand the HRCT findings of otosclerosis in order to provide more information about the disease. Materials and Methods:We selected 42 HRCT available patients of 126 patients who were operated in (scan thickness 1 mm, scan interval 1 mm) CT scanner. Results:There were radiolucent lesions in 48 ears (62% ). The lesi-ons were found in the fisula ante fenestram, cochlea, and the semicircular canal. Conclusions:HRCT could be used as an adjunctive diagnostic tool for the detection of otosclerotic lesion, stapedial or cochlear. We could find positive findings in 62% of the patients who showed progresive and conductive hearing loss. (Korean J Otolaryngol 2002;45:118-21)