has characteristic has characteristic low grade central osteosarcoma UMLS:C3814534 low-grade intramedullary osteosarcoma NCIT:C6474 low-grade central osteosarcoma low grade intramedullary 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. MONDO:0006271 ONCOTREE:LGCOS ICDO:9187/3 MEDGEN:818980 low grade central osteosarcoma intraosseous well-differentiated osteosarcoma intraosseous well-differentiated osteogenic sarcoma osteosarcoma tumor grade 1, general grading system