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Background and Objectives:Otosclerosis is known to be rare in orientals, but there have been a few reports of the cli-nically suspicious otosclerosis cases in Korea. Confirmation of otosclerosis, in theory, should be done by histopathology. research, we had surgical specimens available for a review of otosclerosis case. We aimed to confirm the pathologic findings of otosclerosis in Koreans, and review their clinical information. Subjects and Method:Among 126 otosclerosis patients who were operated in the Seoul National University Hospital from January 1981 to December 2001, three cases were selected for pathologic evaluation. We used the H & E method for staining. Results:in all three cases. Two typical phases (early spongiotic and late sclerotic of otosclerosis) could be observed in specimen. Conclusion:In the pathologic specimen from the patients showing progresive conductive hearing loss, we could confirm otosclerosis. Both early and late phase of otsclerotic foci coexisted in the same specimen. (Korean J Otolaryngol 2002; 45:557-60)