| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Structure of frontal extradural space | Is a | True | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of occipital extradural space | Is a | True | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of parietal extradural space | Is a | True | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of temporal extradural space | Is a | True | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of sagittal extradural space | Is a | True | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of subfrontal extradural space | Is a | True | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of subtemporal extradural space | Is a | True | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier |  | 
| Drainage of extradural space | Procedure site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Evacuation of intracranial extradural hematoma | Procedure site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Evacuation of intracranial extradural abscess | Procedure site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Epidural intracranial abscess | Finding site | True | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Epidural supratentorial pyogenic abscess | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of intracranial extradural tumor | Procedure site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Traumatic intracranial extradural hematoma | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Non-traumatic extradural intracranial hematoma | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of lesion from intracranial extradural space | Procedure site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural infratentorial pyogenic abscess | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural intracranial hemorrhage in fetus or newborn | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier |  | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with no loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Open traumatic extradural hemorrhage | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury with open intracranial wound, with no loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Closed traumatic extradural hemorrhage | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified drainage of extradural space | Procedure site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of extradural space NOS | Procedure site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, unspecified state of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with concussion, unspecified | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury with open intracranial wound, unspecified state of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, with concussion, unspecified | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Closed traumatic extradural hemorrhage | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, unspecified state of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with concussion, unspecified | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Extradural hemorrhage following injury with open intracranial wound, unspecified state of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Extradural hemorrhage following injury with open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury with open intracranial wound, with concussion, unspecified | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Removal of intracranial extradural tumor | Procedure site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Non-traumatic extradural intracranial hematoma | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with no loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 5 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 5 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 5 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 5 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 5 | 
| Open traumatic extradural hemorrhage | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury with open intracranial wound, with no loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Extradural hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Extradural hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Extradural hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Closed traumatic extradural hemorrhage | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, unspecified state of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with concussion, unspecified | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury with open intracranial wound, unspecified state of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury with open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, with concussion, unspecified | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of intracranial extradural tumor | Procedure site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Non-traumatic extradural intracranial hematoma | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with no loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury with open intracranial wound, with no loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Open traumatic extradural hemorrhage | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury with open intracranial wound, with concussion, unspecified | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Closed traumatic extradural hemorrhage | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with no loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, with no loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Extradural hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, unspecified state of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Non-traumatic extradural intracranial hematoma | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, unspecified state of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Removal of intracranial extradural tumor | Procedure site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with concussion, unspecified | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Extradural hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Open traumatic extradural hemorrhage | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury with open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Closed traumatic extradural hemorrhage | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Extradural hemorrhage following injury without mention of open intracranial wound, with no loss of consciousness | Finding site | False | Structure of extradural space of brain | Inferred relationship | Existential restriction modifier | 2 |