High-grade surface osteosarcomas*

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Abstract
Nine patients (7 males and 2 females) had high-grade, ordinary-type osteosarcomas that were juxtacortically located. The ages of these patients ranged from 9-62 yr at the time of diagnosis. The roentgenographic appearance of these tumors occasionally is similar to that of periosteal osteosarcomas. Histologically, these tumors were indistinguishable from ordinary high-grade intramedullary osteosarcomas. None of the 9 tumors had histologic features of parosteal or periosteal osteosarcomas. All 9 patients were treated by ablative surgery. Seven patients died of tumor. Because of its poorer prognosis, this tumor should be differentiated from other juxtacortical osteosarcomas.

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