A small osteoma of the frontal sinus causing headaches.

Osteomas of the frontal sinus are usually symptomless. When they enlarge they may produce pressure symptoms such as headaches. Small osteomas developing near the fronto-ethmoidal duct may interfere with the patency of the duct and impair the aeration of the sinus. This is a report of a case in which a small osteoma was found to be the cause of severe chronic headaches.