Evolution of an aneurysmal bone cyst: a case report.

The aneurysmal bone cyst (ABC) rarely occurs in the jaws. It represents approximately 1.5% of all non-odontogenic and non-epithelial cysts of the jaws. The literature contains conflicting reports on the clinical and radiological features of ABC of the jaws. The radiographic appearance of ABC varies from a unicystic radiolucency or moth-eaten radiolucency to an extensive multilocular lesion. In this article, we describe the transition of an ABC in the maxillofacial region from a unilocular radiolucent lesion to a radiopaque lesion in a 40-year-old female over a 10-month period, which indicates diversity in the clinical and biologic behavior of ABCs.