Osteoid osteomas are benign osseous lesions that are extremely rare in the ethmoid sinuses. Osteoid osteomas can be easily identified radiologically by the presence of a central nidus surrounded by dense sclerotic bone on computed tomography (CT). In this article, we report a new case of osteoid osteoma that originated in the ethmoid sinus.
A 15-year-old girl presented to our ENT department with a 1-month history of an enlarging right-sided superior orbital mass. She denied any history of sinusitis, vision changes, or relevant trauma.