Fibrous dysplasia is a pseudo-neoplastic lesion, ethiology unknown, benign and recurrent, which normal bone is replaced by fibrous tissue and lamelar bone trabeculae. The main differential diagnosis of the monostotic form on head and neck bones is Ossifying Fibroma which some consider another form of the same entity. The purpose of this study is to make a review of the main clinical, radiological and histopathological findings that contributes to the differential diagnosis. The recurrent behavior of Fibrous Dysplasia is essential to its surgical planning and it was also analyzed on this study. We have reported three cases followed at the ENT department of Irmandade da Santa Casa de Misericórdia de São Paulo evaluated based on the patients symptoms, physical exam, imaging findings and treatment. In all three cases, the diagnosis was confirmed based on histopathological findings. All of them had recurrences after surgical removal, diagnosed between first and eighth year of follow up. Due to Fibrous Dysplasia and Ossifying Fibroma similar clinical courses, the histopathological findings are essential to their differential diagnosis. The long term follow up of this pacients is necessary in order to make an early diagnosis of recurrences.
fibrous dysplasia; recurrence; differential diagnostic; ossifying fibroma
