| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Subdural hemorrhage following injury with open intracranial wound, unspecified state of consciousness | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Subdural hemorrhage following injury with open intracranial wound, with concussion, unspecified | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Evacuation of intracranial subdural abscess | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Subdural hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Subdural 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 | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 5 | 
| Subdural hemorrhage following injury with open intracranial wound, with no loss of consciousness | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Subdural hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Removal of external subdural drain | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified drainage of subdural space | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural 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 | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Renewal of external subdural drain | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Drainage of subdural space | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Drainage of subdural space NOS | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, unspecified state of consciousness | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Subdural hemorrhage following injury with open intracranial wound, with concussion, unspecified | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of cerebral subdural space by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Drainage of cerebral subdural space by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of cerebral subdural space by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Evacuation of intracranial subdural abscess | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Subdural hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural 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 | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, with no loss of consciousness | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Subdural hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Other specified drainage of subdural space | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of shunt from intracranial subdural space | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of subdural-peritoneal shunt | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of subdural-pleural shunt | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of external subdural drain | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of intracranial space, subarachnoid or subdural by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of intracranial space, subarachnoid or subdural by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Drainage of intracranial space, subarachnoid or subdural by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Drainage of cerebral subdural space by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of cerebral subdural space by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Drainage of cerebral subdural space by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Drainage of intracranial space, subarachnoid or subdural by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Drainage of intracranial space, subarachnoid or subdural by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of intracranial space, subarachnoid or subdural by incision or trephination | Procedure site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Evacuation of intracranial subdural abscess | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of intracranial subdural tumor | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Renewal of external subdural drain | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of lesion from intracranial subdural space | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury without open intracranial wound AND with brief loss of consciousness (less than one hour) | Finding site | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Evacuation of subdural hematoma | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Evacuation of intracranial subdural abscess | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of intracranial subdural tumor | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Removal of lesion from intracranial subdural space | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of cerebral subdural space by incision or trephination | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Evacuation of intracranial subdural abscess | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of shunt from intracranial subdural space | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Creation of subdural-peritoneal shunt | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 5 | 
| Creation of subdural-pleural shunt | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Creation of subdural-pleural shunt | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Creation of external subdural drain | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Revision of shunt in intracranial subdural space | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Revision of subdural-peritoneal shunt | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Revision of subdural-pleural shunt | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Revision of external subdural drain | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Renewal of shunt in intracranial subdural space | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Renewal of subdural-peritoneal shunt | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Renewal of subdural-pleural shunt | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of subdural-pleural shunt | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Injection of antibiotics into intracranial subdural space | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural-pleural shunt operation | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural-peritoneal shunt operation | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| External subdural drain procedure | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Intracranial subdural shunt operation | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of cerebral subdural space by aspiration | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Subdural tap through fontanel, infant, initial | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Subdural tap through fontanel, infant, initial | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural tap through fontanel | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural tap through fontanel | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Incision of cerebral subdural space | Procedure site - Direct | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Structure of subdural space of temporal region | Part of | False | Entire subdural space of brain | Additional relationship | Existential restriction modifier |  | 
| Entire subdural space of basal region | Part of | False | Entire subdural space of brain | Additional relationship | Existential restriction modifier |  | 
| Structure of subdural space of frontal region | Part of | False | Entire subdural space of brain | Additional relationship | Existential restriction modifier |  | 
| Structure of subdural space of infratentorial region | Part of | False | Entire subdural space of brain | Additional relationship | Existential restriction modifier |  | 
| Structure of subdural space of occipital region | Part of | False | Entire subdural space of brain | Additional relationship | Existential restriction modifier |  | 
| Structure of subdural space of basal region | Part of | False | Entire subdural space of brain | Additional relationship | Existential restriction modifier |  | 
| Structure of subdural space of parietal region | Part of | False | Entire subdural space of brain | Additional relationship | Existential restriction modifier |  | 
| Revision of subdural-peritoneal shunt | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Revision of shunt in intracranial subdural space | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of shunt in intracranial subdural space | Procedure site - Indirect | False | Entire subdural space of brain | Inferred relationship | Existential restriction modifier | 1 |