A benign, well-circumscribed, bone-forming neoplasm predominantly composed of lamellar bone. It usually arises from the calvarial, facial, or jaw bones. It is usually asymptomatic but it may cause local swelling or obstruction of the paranasal sinuses. Asymptomatic cases have an indolent clinical course. The disease is osteoma (MONDO_0005166). Also known as: osteoma (disease), osteoma, benign.