Recurrent ossifying fibroma of the maxillary sinus in an adult patient.

In some aspects, the terminology of fibro-osseous lesions of the head remain equivocal. The WHO classification suggested to group cemento-ossifying fibroma and ossifying fibroma under the term "ossifying fibroma". Based on the different age of onset, localization and risk of recurrence, two types have been described: "juvenile ossifying fibroma", with early age of onset, which needs to be treated with wide surgical resection due to the high risk of recurrence; and "adult ossifying fibroma", arising in adult patients, with low recurrence rate, properly treated by conservative surgery. We describe a case of an "adult ossifying fibroma" of a 57-year-old woman with several relapses, for whom conservative therapy was inadequate. We think that the "early" age of onset should not be included among the essential characteristics of ossifying fibroma with a high risk of recurrence.