| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Local intracranial subdural hematoma due to birth trauma | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury without mention of open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Revision of external subdural drain | Procedure site - Indirect | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Creation of external subdural drain | Procedure site - Indirect | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of external subdural drain | Procedure site - Indirect | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury without mention of open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Injection of anesthetic substance, therapeutic, subdural, differential | Procedure site - Direct | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury with open intracranial wound, with concussion, unspecified | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural intracranial hematoma | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Traumatic intracranial subdural hematoma | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, unspecified state of consciousness | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Traumatic spinal subdural hematoma | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Intradural spinal arachnoid cyst | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Intradural spinal arachnoid cyst | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| 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 | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, with no loss of consciousness | Finding site | False | Subdural space structure | 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 | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, therapeutic, subdural, differential | Procedure site - Indirect | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Injection of anesthetic substance, therapeutic, subdural, differential | Procedure site - Indirect | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury with open intracranial wound, with no loss of consciousness | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Revision of external subdural drain | Procedure site - Direct | False | Subdural space structure | 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 | Subdural space structure | 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 | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Revision of external subdural drain | Procedure site - Direct | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Fluid specimen from subdural space | Specimen source topography | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Fluid specimen from subdural space | Specimen source topography | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Hemorrhage into subdural space of neuraxis | Finding site | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Hematoma of subdural space of neuraxis | Finding site | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Traumatic hematoma of subdural space of neuraxis | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Traumatic hematoma of subdural space of neuraxis | Finding site | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 3 | 
| Non-traumatic hematoma of subdural space of neuraxis | Finding site | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Non-traumatic intracranial subdural hematoma | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Non-traumatic hematoma of subdural space of neuraxis | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Non-traumatic intracranial subdural hematoma | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Nontraumatic subdural hematoma with brain compression | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 4 | 
| Injection of anesthetic substance, therapeutic, subdural, continuous | Procedure site - Indirect | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 3 | 
| Injection of anesthetic substance, therapeutic, subdural, differential | Procedure site - Indirect | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hygroma | Finding site | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural effusion | Finding site | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Benign extra-axial hygroma | Finding site | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury with open intracranial wound AND loss of consciousness | Finding site | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Fluid specimen from empyema of subdural space | Specimen source topography | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Replacement of subarachnoid/subdural catheter | Procedure site - Indirect | True | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury without mention of open intracranial wound, with less than 1 hour loss of consciousness (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury without mention of open intracranial wound, with no loss of consciousness (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage NOS (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury with open intracranial wound, unspecified state of consciousness (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, with loss of consciousness of unspecified duration (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury with open intracranial wound, with concussion, unspecified (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 2 | 
| Subdural hemorrhage following injury without mention of open intracranial wound, with 1-24 hours loss of consciousness (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury without mention of open intracranial wound, unspecified state of consciousness (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury without mention of open intracranial wound, with loss of consciousness of unspecified duration (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Subdural hemorrhage following injury without mention of open intracranial wound, with concussion, unspecified (disorder) | Finding site | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified drainage of subdural space | Procedure site - Indirect | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of subdural space NOS | Procedure site - Indirect | False | Subdural space structure | Inferred relationship | Existential restriction modifier | 1 |