The aneurysmatic bone cysts are uncommon bone injuries, but well-recognized occurring a more frequent in long bones and vertebrae of patients with <30 years. As a distinct entity, it was fi rst described by Lichtenstein, they rarely occur in the maxillary sinuses, which may occur concomitantly with other injuries such as brous dysplasia, and central injury of giant cells. The etiology and pathogenesis of this injury are still not completely elucidated, and there is controversy whether injuries arise anew or represent some form of vascular accident in a preexisting injury. Their clinical characteristics such as fast growth, expansion, cortical destruction and osteoid formation can easily confuse the clinician about malignant injuries. This is a case report of a pediatric patient treated of an aneurysmal bone cyst (ABC) associated with juvenile ossifying broma in Buccal