obsolete_Low Grade Central Osteosarcoma true low-grade central osteosarcoma A low grade osteosarcoma arising from the medullary portion of the bone. It 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. 3.88.0 EFO:1000327 ONCOTREE:LGCOS Replaced by Mondo term MONDO_0006271, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0006271 intraosseous well-differentiated osteosarcoma low grade intramedullary osteosarcoma low grade central osteosarcoma ICDO:9187/3 UMLS:C1266163 UMLS:C3814534 NCIT:C6474 http://purl.obolibrary.org/obo/MONDO_0006271 low-grade intramedullary osteosarcoma intraosseous well-differentiated osteogenic sarcoma