Primary osteosarcoma of the ribs: A report from the Cooperative Osteosarcoma Study Group.

This large series provides evidence that patients with costal primaries are older than the average osteosarcoma patient, but appear to share the similar tumor biology and-if treated according to standard protocols-prognostic factors with tumors of other sites. Early, preoperative diagnosis and permanent, definitive local control remain major challenges and should contribute to improved outcomes.