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Osteoma is a benign bone-forming tumor which is most frequently found in the fronto-ethmoidal area. Although comonly discovered in the external auditory canal of the temporal bone, few cases have been reported in the mastoid or squamous portion of the temporal bone. The authors experienced a case of large osteoma that originated from the squama of temporal bone. We report this rare case and its sucesful management with a review of the literatures. (Korean J Otolaryngol 202; 45:915-7)