Abstract
A 33-year-old female complaining of sudden nasal bleeding, left buccal pain and maxillary swelling was sent to our hospital for further examination. CT scans showed a cystic lesion with bone formation in the left maxillary sinus. The patient underwent en bloc removal of this cystic lesion by Denker's operation.
Histological examination revealed that the ossification originated in scar tissue in the cystic wall. The origin of this cystic lesion was presumed to be a polypoid growth from the maxillary sinus mucosa which elongated and folded to form a cyst. Fibrous ossification probably developed in the process following scar formation due to chronic inflammation in the cystic wall.
