Abstract
Fibrous dysplasia is a benign disorder of fibro-osseous tissue. In the head and neck regions, the maxilla and mandible bones are most frequently involved. We, herein, report a case of fibrous dysplasia which originated in the ethmoid sinus. The differentiation of fibrous dysplasia and ossifying fibroma is not unequivocal. From the macroscopic and microscopic findings of our case and some literatures, we determined that it is not feasible to distinguish fibrous dysplasia from ossifying fibroma. Therefore, we considered that it might be more appropriate to term both conditions “benign fibro-osseous lesion”. The accepted treatment for these lesions is surgical resection or curettage. Many authors have suggested that cosmetics and function should be preserved if at all possible, since in both cases the lesions are classified as benign. However, fibrous dysplasia of the ethmoid sinus, tends to proceed on a more “malignant” course, growing faster and threatening vital structures such as the optic nerve and the base of the skull. Therefore, in cases such as ours, we concluded that complete removal of lesions must be ensured, followed by careful postoperative observation.
