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A 38-year-old female with a history of migraine presented to the emergency department due to increased intensity of her usual headache. A computed tomography scan revealed a well-defined, hyperdense, 5-millimeter lesion in the left maxillary sinus, consistent with an osteoma. This was an incidental finding, and the patient did not report any respiratory symptoms or signs of sinusitis. The case is representative of sinus osteomas, which are typically benign, asymptomatic, and slow-growing tumors. Although maxillary sinus involvement is uncommon, the imaging features were characteristic and did not suggest a more aggressive lesion. Since the patient had no local symptoms attributable to the osteoma, surgical treatment was not indicated. This case highlights the importance of recognizing these lesions on imaging studies and distinguishing them from other bone pathologies, as they often do not require intervention when asymptomatic and without functional or aesthetic consequences.
