| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Open fracture of base of skull without mention of intracranial injury, with concussion, unspecified | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull with intracranial injury, with no loss of consciousness | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull with intracranial injury, with less than 1 hour loss of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Intracranial injury co-occurrent and due to closed fracture of base of skull | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull without mention of intracranial injury, unspecified state of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Computed tomography of base of skull | Procedure site - Direct | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Computed tomography of base of skull with contrast | Procedure site - Direct | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Computed tomography of base of skull | Procedure site - Direct | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Computed tomography of base of skull with contrast | Procedure site - Direct | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Excision of bone of cranium and excision of midline neoplasm at base of skull | Procedure site - Direct | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Basilar skull invagination | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull without mention of intracranial injury, unspecified state of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Platybasia | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Excision of bone of cranium and excision of midline neoplasm at base of skull | Procedure site - Direct | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Magnetic resonance imaging of base of skull | Procedure site - Direct | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Magnetic resonance imaging of base of skull | Procedure site - Direct | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Concussion co-occurrent and due to closed fracture of base of skull | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull with loss of consciousness | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 2 | 
| Excision of lesion of base of skull with reconstruction | Procedure site - Direct | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 2 | 
| Excision of lesion of base of skull with reconstruction | Procedure site - Direct | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 3 | 
| Malignant otitis externa | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 2 | 
| Malignant otitis externa caused by Pseudomonas aeruginosa | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 3 | 
| Malignant otitis externa of left external auditory canal | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Malignant otitis externa of right external auditory canal | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 2 | 
| Structure of body of sphenoid bone | Is a | True | Base of skull structure | Inferred relationship | Existential restriction modifier |  | 
| Structure of foramen lacerum | Is a | True | Base of skull structure | Inferred relationship | Existential restriction modifier |  | 
| Structure of greater wing of sphenoid bone | Is a | True | Base of skull structure | Inferred relationship | Existential restriction modifier |  | 
| Structure of lesser wing of sphenoid bone | Is a | True | Base of skull structure | Inferred relationship | Existential restriction modifier |  | 
| Malignant otitis externa of right external auditory canal | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull with cerebral laceration | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull with cerebral contusion | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Craniectomy of base of skull and excision of midline neoplasm of brain | Procedure site - Direct | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 2 | 
| Hyperostosis cranialis interna | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Hyperostosis cranialis interna | Finding site | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 2 | 
| Reconstruction of anterior skull base using pedicle inferior turbinate flap | Procedure site - Direct | True | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Computerised tomography of base of skull (procedure) | Procedure site - Direct | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Computerised tomography of base of skull with contrast (procedure) | Procedure site - Direct | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull without mention of intracranial injury, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull without mention of intracranial injury, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture base of skull without mention of intracranial injury | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull without mention of intracranial injury, with no loss of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull without mention of intracranial injury, with less than 1 hour loss of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull without mention of intracranial injury, with 1-24 hours loss of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull with intracranial injury, with loss of consciousness of unspecified duration | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull with intracranial injury, unspecified state of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull with intracranial injury, with concussion, unspecified | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Fracture of base of skull NOS | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull without mention of intracranial injury, with no loss of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull without mention of intracranial injury, with less than 1 hour loss of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull without mention of intracranial injury, with 1-24 hours loss of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull without mention of intracranial injury, with more than 24 hours loss of consciousness and return to pre-existing conscious level | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull without mention of intracranial injury, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull without mention of intracranial injury, unspecified state of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull with intracranial injury, with loss of consciousness of unspecified duration | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull without mention of intracranial injury, with concussion, unspecified | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull with intracranial injury, unspecified state of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull without mention of intracranial injury, with concussion, unspecified | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull without mention of intracranial injury, with loss of consciousness of unspecified duration | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull without mention of intracranial injury, with loss of consciousness of unspecified duration | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture of base of skull with intracranial injury, with concussion, unspecified | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture of base of skull without mention of intracranial injury, unspecified state of consciousness | Finding site | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 | 
| Magnetic resonance imaging of base of skull (procedure) | Procedure site - Direct | False | Base of skull structure | Inferred relationship | Existential restriction modifier | 1 |