Parosteal (juxtacortical) osteosarcoma of the distal femur.
D000328:Adult; D003238:Connective Tissue; D005260:Female; D005266:Femoral Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D006801:Humans; D007717:Knee; D012516:Osteosarcoma / Q000000981:diagnostic imaging / Q000473:pathology*; D011859:Radiography