An Isolated Laminar Osteoma Arising in the Maxillary Sinus.

BACKGROUND Osteomas are benign tumors characterized by proliferation of dense or trabecular bone. Most osteomas of the head and neck occur in the mandible, they rarely occur in the maxillary sinus, and free osteomas are extremely rare. While usually detected incidentally on plain radiographs, symptoms appear when the osteoma obstructs the sinus orifice or invades the adjacent orbit or intracranial structures.