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Objective: We present the case of a frontal sinus osteoma in a 71-year-old Japanese woman who presented with an approximately 2-year history of head dullness. Case report: CT showed a 45×39 mm radio dense mass extending from the left to the right frontal sinus. Under general anesthesia the mass was removed by endoscopic surgery. Although the tumor was large and extended into both frontal sinuses, the tumor was completely removed, without CSF leakage or orbital complications, by using a modifieddoi:10.4172/2161-119x.1000140 fatcat:ra5nean3xnbgbegterrine7pp4