Abstract
Osteosarcoma is the true malignant neoplasm of bone in which the malignant osteoblasts differentiate from the sarcomatous stroma and produce tumorous osteoid, tumorous bone and sometimes even tumorous cartilage. An uncommon separate class of osteosarcomas termed juxtacortical osteosarcoma, which includes intermediate grade periosteal and low-grade paraosteal variants represents less than 4% of all osteosarcomas and 1 % of all bone tumours. Juxtacortical osteosarcoma (incidence of 0.07 per 100,000 populations) occurs much less commonly than central medullary osteosarcoma. They have less aggressive biological behaviour as compared to the conventional type. So it is important to recognize these subtypes of osteosarcomas to plan treatment appropriately and avoid overtreatment. Juxtacortical osteosarcoma of the jaws appears to have a slightly more favourable prognosis than in long bones, although a larger series of cases needs to be evaluated before a definitive conclusion concerning the behaviour of juxtacortical osteosarcoma of the jaws can be made.
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