Bilateral Nonossifying Fibroma of the Mandible: A case report of a rare entity.

Nonossifying fibroma (NOF) is a benign lesion confined to the bone marrow and connective tissues without exhibiting osseous metaplasia. NOF of long bones in children is more common than its gnathic counterpart. Mandibular NOF is rare, and there is a paucity of information in the literature. NOF of the jaws clinically presents as a nodular, fibrous, asymptomatic, gingival, or alveolar mucosal enlargement, with or without facial swelling. NOF differs from the ossifying type by the presence of metastatic woven bone in ossifying type. This article reports an example of bilateral, multilocular, NOF of the mandible in a 15-year-old female patient with unilateral, asymptomatic facial asymmetry. The radiographic features were characteristic of NOF. It was treated successfully with surgical excision and curettage. A 2-year postoperative follow-up showed recurrence of the right lesion and needed secondary surgical intervention, and the tumor on the left side, however, healed well without recurrence.