| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Entire cranial subarachnoid space | Is a | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of subarachnoid cistern | Is a | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier |  | 
| Multiple closed fractures of skull AND/OR face with subarachnoid, subdural AND/OR extradural hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Closed fracture of base of skull with subarachnoid, subdural AND/OR extradural hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Open fracture of base of skull with subarachnoid, subdural AND/OR extradural hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Pneumoencephalography | Procedure site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Multiple open fractures of skull AND/OR face with subarachnoid, subdural AND/OR extradural hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 5 | 
| Open skull fracture with subarachnoid, subdural AND/OR extradural hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 5 | 
| Open fracture of vault of skull with subarachnoid, subdural AND/OR extradural hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Open fracture of vault of skull with subarachnoid, subdural AND/OR extradural hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Pneumoventriculography | Procedure site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Closed fracture of vault of skull with subarachnoid, subdural AND/OR extradural hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Structure of cerebellar subarachnoid space | Is a | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of frontal subarachnoid space | Is a | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of occipital subarachnoid space | Is a | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of parietal subarachnoid space | Is a | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of sagittal subarachnoid space | Is a | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier |  | 
| Entire subarachnoid space of brain | Is a | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier |  | 
| Structure of temporal subarachnoid space | Is a | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier |  | 
| Operation on subarachnoid space of brain | Procedure site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of subarachnoid space of brain | Procedure site - Indirect | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of subarachnoid space of brain | Procedure site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 3 | 
| Arachnoid cyst of pituitary | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Cerebral arachnoid cyst | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage due to traumatic injury | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Spontaneous intracranial subarachnoid hemorrhage | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Incision of cerebral subarachnoid space | Procedure site - Direct | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of cerebral subarachnoid space by aspiration | Procedure site - Direct | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Drainage of cerebral subarachnoid space by aspiration | Procedure site - Indirect | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury with open intracranial wound AND moderate loss of consciousness (1-24 hours) | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from carotid siphon and bifurcation | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Intracranial subarachnoid hemorrhage from vertebral artery | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Intracranial subarachnoid hemorrhage due to birth injury | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury without mention of open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid 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 subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subarachnoid 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 subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid 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 subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid 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 subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subarachnoid hemorrhage due to ruptured arteriovenous malformation | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Intracranial subarachnoid hemorrhage due to ruptured aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from multiple aneurysms | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from anterior cerebral artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from middle cerebral artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from posterior cerebral artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from anterior communicating artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from posterior communicating artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from basilar artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from posterior inferior cerebellar artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from carotid artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified operation on subarachnoid space of brain | Procedure site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Operation on subarachnoid space of brain NOS | Procedure site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 2 | 
| Subarachnoid hemorrhage following injury with open intracranial wound, unspecified state of consciousness | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury with open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury with open intracranial wound, with concussion, unspecified | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from anterior cerebral artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from multiple aneurysms | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from carotid artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from posterior cerebral artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from posterior communicating artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from middle cerebral artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from basilar artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from posterior inferior cerebellar artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage due to traumatic injury | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull with subarachnoid, subdural AND/OR extradural hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Intracranial subarachnoid hemorrhage due to birth injury | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Perinatal intracranial subarachnoid hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of vault of skull with subarachnoid, subdural AND/OR extradural hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 4 | 
| Subarachnoid hemorrhage from anterior communicating artery aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from carotid siphon and bifurcation | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Intracranial subarachnoid hemorrhage from vertebral artery | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Intracranial subarachnoid hemorrhage due to ruptured aneurysm | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from middle cerebral artery aneurysm | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from posterior cerebral artery aneurysm | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from carotid artery aneurysm | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Cerebral arachnoid cyst | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury with open intracranial wound, unspecified state of consciousness | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from anterior communicating artery aneurysm | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from posterior inferior cerebellar artery aneurysm | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Spontaneous intracranial subarachnoid hemorrhage | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of subarachnoid space of brain | Procedure site - Indirect | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury with open intracranial wound, with concussion, unspecified | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Perinatal intracranial subarachnoid hemorrhage | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Drainage of cerebral subarachnoid space by aspiration | Procedure site - Indirect | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Intracranial subarachnoid hemorrhage from vertebral artery | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Intracranial subarachnoid hemorrhage due to ruptured aneurysm | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage due to ruptured arteriovenous malformation | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury with open intracranial wound, with loss of consciousness of unspecified duration | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from multiple aneurysms | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from basilar artery aneurysm | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage due to traumatic injury | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from carotid siphon and bifurcation | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from posterior communicating artery aneurysm | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage from anterior cerebral artery aneurysm | Finding site | True | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury without mention of open intracranial wound, with 1-24 hours loss of consciousness | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Intracranial subarachnoid hemorrhage due to birth injury | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Subarachnoid hemorrhage following injury with open intracranial wound AND moderate loss of consciousness (1-24 hours) | Finding site | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 | 
| Fistulization of cerebral subarachnoid space | Procedure site - Direct | False | Structure of subarachnoid space of brain | Inferred relationship | Existential restriction modifier | 1 |