Low-grade intraosseous osteosarcoma of the jaws.

Two cases of low-grade intraosseous osteosarcomas are reported, bringing the total number of such osteosarcomas in the jawbones documented in recent literature to six. Our first case involved the maxilla of a 69-year-old man and the second involved the mandible of an 18-year-old girl. In clinical and microscopic appearance, these neoplasms resemble benign proliferations in many respects. Subtle differences include cortical bone destruction, soft tissue infiltration, irregular bone production with foci of abundant osteoid, and mild cellular atypia. Complete removal at the first attempt is of paramount importance, inasmuch as a significant percentage of these neoplasms recur as high-grade osteosarcomas if they are inadequately treated.