An expanded juvenile ossifying fibroma in maxillary sinus: a case report

Juvenile ossifying fibroma (JOF) is an expansive intraosseous lesion of the bones, comprising fibrous cell tissue that contains spheroid calcifications and randomly oriented mineralized structures. It is presented by patients under 15 years old. They are non-odontogenic lesions that imitate odontogenic lesions. The differential diagnosis is fibro-osseous lesions of the jaw, such as cemento-ossifying fibroma, osteoid osteoma or bone dysplasia. Clinically, it is a large asymptomatic tumor of aggressive appearance due to the bone destruction it produces. The lesion is not encapsulated, although it is well demarcated from the surrounding bone. The essential characteristics of this clinical entity are as follows: the early age of onset, the bone pattern, the high tendency to recurrence and the aggressive local behavior. The treatment consists of surgical excision. A minimum 5year follow-up of these patients is essential. In this article we describe a case of expanded juvenile ossifying fibroma in right maxilla in a 12-year old boy. II. Case report