JUVENILE OSSIFYING FIBROMA AND FIBROUS DYSPLASIA: A CASE REPORT OF A COMPLEX DIFFERENTIAL DIAGNOSIS

The authors describe a case report of a 10-year-old female patient with a painless, rapid, progressive, expansive swelling in the anterior mandible region. Radiographically, the lesion was a unilocular radiolucency with well-delineated margin, "ground glass" appearance, and 32 and 33 teeth roots displacement. Incisional biopsy was performed, and result of juvenile ossifying fibroma (JOF) was obtained. Surgical resection of the lesion and involved bone was performed, but histopathologic feature of the surgical specimen was consistent with fibrous dysplasia (FD). In a 3-month follow-up time, the patient presents no recurrence. Differential diagnosis in fibro-osseous lesions may be difficult to establish. Margin definitions, fibrous capsule presence, and analysis of immature bone, may be relevant in differential diagnosis of FD and JOF. However, when these lesions have any atypical presentation, FD or JOF characteristics may mimic themselves histologically and radiographically.