Extraosseous osteosarcoma.
D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000556:secondary; D008875:Middle Aged; D012516:Osteosarcoma / Q000473:pathology* / Q000556:secondary; D012983:Soft Tissue Neoplasms / Q000473:pathology*; D013848:Thigh