Early sarcomatous changes in Paget's disease of bone.
D000368:Aged; D005260:Female; D005266:Femoral Neoplasms / Q000473:pathology*; D006801:Humans; D010001:Osteitis Deformans / Q000473:pathology*; D012516:Osteosarcoma / Q000175:diagnosis / Q000473:pathology*