Trabecular juvenile ossifying fibroma with aneurysmal bone cyst: a rare presentation.

Juvenile ossifying fibroma is an uncommon, benign, bone-forming neoplasm that is distinguished from other fibro-osseous lesions primarily by its age of onset, clinical presentation, and potential behavior. It mainly occurs in juveniles and has a slight male predilection and more aggressive behavior than a common ossifying fibroma. There are 2 distinct histopathological variants of this lesion: (1) psammomatoid pattern and (2) trabecular pattern. An aneurysmal bone cyst may occur in association with other bone lesions, such as fibrous dysplasia, ossifying fibroma, and giant cell lesion. The clinical management and prognosis of juvenile ossifying fibroma is somewhat uncertain, and this tumor has high rates of recurrence. Such behavior may be related to younger patient age and the concurrent development of aneurysmal bone cyst. The purpose of this paper was to report a case of trabecular juvenile ossifying fibroma in a 9-year-old girl associated with an aneurysmal bone cyst, presenting an aggressive behavior, and causing significant facial asymmetry.