| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Entire retropancreatic tissue | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Entire perirenal fascia | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Entire periadrenal tissue | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Entire peripancreatic tissue | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Entire periureteral tissue | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Structure of perirenal fascia | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Entire perirenal tissue | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Structure of periureteral tissue | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Structure of periadrenal tissue | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Perirenal tissue structure | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Structure of peripancreatic tissue | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  | 
| Structure of retropancreatic tissue | Part of | False | Entire retroperitoneal region, excluding major organs | Additional relationship | Existential restriction modifier |  |