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Osteomas are benign neoplasms of bone which usually produce symptoms secondary to pressure on adjacent structures. In the head and neck region, osteomas most commonly arise in fronto-ethmoidal areas. In the temporal bone, the external auditory canal is the favored location, while mastoid is not. This paper reviewed a case of an osteoma of the mastoid with a cosmetic problem. (Korean J Otolaryngol 2002;45:617-9)