_:vb50955208 . . _:vb50955208 . "NCI:C27376"^^ . _:vb50955208 . "UMLS_CUI:C1332968"^^ . . "childhood extraosseous osteosarcoma"^^ . _:vb50955208 . "pediatric extraskeletal Osteosarcoma"@en . . . "DOID:7297"^^ . . "disease_ontology"^^ . _:vb50955208 .