Aggressive cemento-ossifying fibroma of the jaws

The cemento-ossifying fibroma is probably the most frequent fibro-osseous l esion seen by oral pathologists. Occasionally, reports of lesions behaving in an aggresive fashion appear in the literature. At the present time, the relationship if these "aggressive" lesions to the "usual" fibromas is uncle ar. Two cases of "aggressive" cemento-ossifying fibroma are reported. Certa inly, clinical, radiological, and histological characteristics of aggressiv e and usual fibromas do coincide. There are, however, diverging features wa rranting separation of different forms. These mild differences may be detec ted during preoperative assessment of the lesion, allowing a diagnosis of a ggressive form to be made. (C) 2000 Elsevier Science Ltd. All rights reserv ed.