Source:http://linkedlifedata.com/resource/umls/id/C1266163
NCI: A low grade osteosarcoma that arises from the medullary cavity of bone.,NCI: A low grade osteosarcoma arising from the medullary portion of the bone. The tumor affects the long bones and is characterized by the presence of fibroblastic stroma and osteoid production. Pain and swelling are the usual sign and symptom. The prognosis is more favorable than conventional osteosarcoma.