Hemangioendothelial sarcoma.
D000293:Adolescent; D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006390:Hemangioendothelioma / Q000000981:diagnostic imaging / Q000473:pathology*; D006801:Humans; D009367:Neoplasm Staging; D010329:Patella; D011859:Radiography