FIBROOSSEOUS LESIONS OF THE FACE AND SKULL WITH ANEURYSMAL BONE-CYST FORMATION

Aneurysmal bone cyst engraftment on benign fibro-osseous lesions, well known to occur in the extracranial skeleton, has been reported infreq uently in the craniofacial bones. When this combined lesion occurs in the skull the clinical and radiographic features often suggest an aggr essive neoplasm. The clinical, radiographic, and pathologic features o f five cases are presented, and this uncommon lesion of the craniofaci al bones is discussed in view of these cases and those reported in the literature.