pediatric osteosarcoma childhood parosteal osteosarcoma https://www.malacards.org/card/childhood_parosteal_osteogenic_sarcoma MONDO:0003654 DOID:5809 GARD:0023604 childhood parosteal osteogenic sarcoma UMLS:C1332994 A low grade malignant bone-forming mesenchymal neoplasm arising from the surface of the bone. It occurs in childhood and usually affects the distal posterior femur, the proximal tibia, and proximal humerus. Painless swelling is the usual clinical sign. The prognosis is usually excellent. childhood parosteal osteosarcoma NCIT:C6589 MEDGEN:272467 juxtacortical osteosarcoma