RESUMO
Aneurysmal bone cyst (ABC) is an uncommon osteolytic lesion of the bones, usually affecting the long bones and spine. The lesion is rare in the jaws and is found most commonly in the body and ramus of the mandible. In some cases, ABCs may be present as rdestructive lesions simulating malignancies. In these cases, a careful diagnosis should be done, including in the differential diagnosis malignant tumors such as telangiectasic osteosarcoma and intraosseous fibrosarcoma. Removing the lesion is usually easy if it is confined within the bone, but it may prove difficult if the lesions are multilocular, expansive, divided by multiple bony septa, or destructive or when the cortical is perforated. Therefore, the surgical treatment of the destructive ABCs should be more radical.