[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. ( NCI )]
UMLS (NCI) C1266163Intraosseous Well-Differentiated Osteosarcoma
Low Grade Central Osteosarcoma