Sequential Ewing's sarcoma and osteosarcoma.

The sequential occurrence of two primary bone tumors, Ewing's sarcoma and osteosarcoma in the same patient at two different anatomical sites 5 years apart is rare. We report a case of 12-year-old boy who after treatment for Ewing's sarcoma of proximal fibula subsequently presented, 4 years later, with a high-grade fibroblastic osteosarcoma of the proximal humerus. The patient was also found to have a rare gene tranlocation t (7;22) instead of the more common t (11;22).