organ system cancer retroperitoneal cancer ICD10CM:C48 DOID:5875 SNOMEDCT_US_2020_03_01:254617008 UMLS_CUI:C0153464 UMLS_CUI:C0153465 SNOMEDCT_US_2020_03_01:187801002 ICD9CM:158.0 ICD9CM:158 DOID:9860 UMLS_CUI:C0035358 ICD10CM:C48.0 MESH:D012186 NCI:C3537 SNOMEDCT_US_2020_03_01:363420003 An organ system cancer located_in the retroperitoneal space that is manifested in retroperitoneal space in the abdominal cavity behind the peritoneum. disease_ontology DOID:12340 NCI:C3357 malignant neoplasm of retroperitoneum malignant neoplasm of retroperitoneum and peritoneum malignant retroperitoneal cancer malignant tumor of peritoneum and retroperitoneum neoplasm of retroperitoneum neoplasm of the retroperitoneum retroperitoneal neoplasm tumor of retroperitoneum