| Outbound Relationships | Type | Target | Active | Characteristic | Refinability | Group | Values | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Is a | Malignant tumor of peritoneum and retroperitoneum | false | Inferred relationship | Existential restriction modifier |  |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Pathological process | Malignant neoplastic process | false | Inferred relationship | Existential restriction modifier |  |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Finding site | Abdominopelvic cavity structure | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Neoplasm | false | Inferred relationship | Existential restriction modifier | 3 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Finding site | Anatomical structure | false | Inferred relationship | Existential restriction modifier | 3 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Finding site | Peritoneum | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Neoplasm, malignant, uncertain whether primary or metastatic | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Finding site | Retroperitoneal compartment structure | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant neoplasm of retroperitoneum and peritoneum NOS | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  |