| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Entire odontoid process of axis | Is a | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier |  | 
| Transoral excision of odontoid peg | Procedure site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 2 | 
| Transoral excision of odontoid peg | Procedure site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture axis, odontoid process | Finding site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture axis, odontoid process | Finding site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Excision of odontoid peg | Procedure site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Odontoid peg X-ray | Procedure site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Fracture of odontoid peg | Finding site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Arthrodesis by anterior transoral technique, clivus-C1-C2, with bone graft and excision of odontoid process | Procedure site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Arthrodesis by anterior extraoral technique, clivus-C1-C2, with bone graft and excision of odontoid process | Procedure site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Arthrodesis by anterior transoral technique, clivus-C1-C2, with bone graft and excision of odontoid process | Procedure site - Direct | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Arthrodesis by anterior extraoral technique, clivus-C1-C2, with bone graft and excision of odontoid process | Procedure site - Direct | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Transoral excision of odontoid peg | Procedure site - Direct | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Excision of odontoid peg | Procedure site - Direct | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Odontoid peg X-ray | Procedure site - Direct | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Arthrodesis by anterior transoral technique, clivus-C1-C2, with bone graft and excision of odontoid process | Procedure site - Direct | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Arthrodesis by anterior extraoral technique, clivus-C1-C2, with bone graft and excision of odontoid process | Procedure site - Direct | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Transoral excision of odontoid peg | Procedure site - Direct | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Open fracture axis, odontoid process | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Odontoid peg X-ray | Procedure site - Direct | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Fracture of odontoid peg | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Closed fracture axis, odontoid process | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Basilar skull invagination | Finding site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 2 | 
| Basilar skull invagination | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 2 | 
| Os odontoideum | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital aplasia of odontoid process | Finding site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Developmental anomaly of odontoid process of axis | Finding site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital aplasia of odontoid process | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Developmental anomaly of odontoid process of axis | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Developmental anomaly of odontoid process of axis | Finding site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 2 | 
| Congenital aplasia of odontoid process | Finding site | False | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 2 | 
| Type I fracture of odontoid process of axis | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Type II fracture of odontoid process of axis | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Type III fracture of odontoid process of axis | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital hypoplasia of odontoid process of axis | Finding site | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 1 | 
| Arthrodesis by anterior transoral technique, clivus-C1-C2, with bone graft and excision of odontoid process | Procedure site - Direct | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 3 | 
| Arthrodesis by anterior extraoral technique, clivus-C1-C2, with bone graft and excision of odontoid process | Procedure site - Direct | True | Structure of odontoid process of axis | Inferred relationship | Existential restriction modifier | 3 |