Maxillary sinus osteoma: two cases and review of the literature.

Osteomas are benign tumours characterized by proliferation of compact or cancellous bone. The most common site is the mandible, followed by the sinuses. These tumours are slow-growing, usually asymptomatic, and are generally discovered as incidental radiological findings. Osteomas occur commonly in frontal sinus, followed by the ethmoid and maxillary sinus, and very rarely in the sphenoid sinus. Symptoms arise when osteomas obstruct the ostium of the sinus or impinge on adjacent orbital or intracranial structures. Two cases of maxillary sinus osteoma are presented along with a review of the literature.