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