| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Ear, face and neck congenital anomalies | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| [X]Crushing injury of head, part unspecified | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Ultrasonography of head and neck | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Burn of head AND/OR neck | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Cut of head and neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Ear, nose and throat examination - general NOS | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Crush injury, face, scalp and neck NOS | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Nail wound of head and neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Biopsy of head and neck structure | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Specimen from head and neck structure obtained by biopsy | Specimen source topography | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Specimen from head and neck structure obtained by fine needle aspiration biopsy | Specimen source topography | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Fine needle aspiration biopsy of head and neck structure | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Fine needle aspiration biopsy of head and neck structure | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Specimen from head and neck structure obtained by fine needle aspiration biopsy | Specimen source topography | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Specimen from head and neck structure obtained by biopsy | Specimen source topography | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Full thickness burn of multiple sites of face, head or neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Full thickness burn of face, head or neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Crush injury, face, scalp and neck NOS | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Third degree burn of face, head AND/OR neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Biopsy of head and neck structure | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Abrasion and/or friction burn of head and/or neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Abrasion and/or friction burn of head and/or neck without infection | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Abrasion and/or friction burn of head and/or neck | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Abrasion and/or friction burn of head and/or neck without infection | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Nail wound of head and neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Head and neck swelling | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Adenocarcinoma of head and neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Secondary revision of orbitocraniofacial reconstruction | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Adenocarcinoma of head and neck | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Secondary revision of orbitocraniofacial reconstruction | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital malformation of eye, ear and neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Incision and drainage of abscess of head and/or neck | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Incision and drainage of abscess of head and/or neck | Procedure site - Indirect | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Incision and drainage of abscess of head and/or neck | Procedure site - Indirect | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Incision and drainage of abscess of head and/or neck | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Benign neoplasm of connective tissue of head and/or neck | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Burn of eye region with epidermal burn of head and/or neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Burn of eye region with partial thickness burn of head and/or neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Burn of eye region with full thickness burn of head and/or neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 3 | 
| Elongated styloid process syndrome | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier |  | 
| Abrasion of head and/or neck | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Structure of peripheral nerve of head and neck | Is a | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier |  | 
| Crush injury of face and scalp | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Structure of mouth and/or pharynx | Is a | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier |  | 
| Magnetic resonance imaging of head and neck with contrast | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Magnetic resonance imaging of head and neck | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Acephalobrachius | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 4 | 
| Head and neck lymphadenopathy | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Insect bite of head and neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Pedicle myocutaneous flap to lip | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 3 | 
| Low mandibular plane angle | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Steep mandibular plane angle | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Aspiration of head and neck using ultrasonographic guidance | Procedure site - Indirect | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Aspiration of head and neck using ultrasonographic guidance | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 3 | 
| Flat mandibular plane angle | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of foreign body from head and neck using imaging guidance | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Removal of foreign body from head and neck using imaging guidance | Procedure site - Indirect | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 3 | 
| Paramandibular actinomycosis | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Cervicofacial actinomycosis | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Squamous cell carcinoma of head and neck | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Full thickness burn of head and/or neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Partial thickness burn of multiple sites of face, head or neck | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Deep full thickness burn of multiple sites of face, head or neck without loss of body part | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Partial thickness burn of multiple sites of face, head and/or neck without involvement of eye proper | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Radiotherapy: temporary head/neck implant | Procedure site - Indirect | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Radiotherapy: infuse head/neck | Procedure site - Indirect | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Open wound of head, neck and trunk | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Branchial cleft external sinus | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Branchial cleft internal sinus | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| First branchial cleft cyst | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Branchial cleft sinus and fistula | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Branchial cleft sinus and fistula | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 2 | 
| Branchial cleft anomaly | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Sinus of branchial cleft | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Branchial cleft cyst | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Fistula of branchial cleft | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Primary squamous cell carcinoma of branchial cleft | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Malignant tumor of branchial cleft | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Primary malignant neoplasm of branchial cleft | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Contusion of face, scalp and neck, excluding eye(s) | Finding site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Structure of peripharyngeal space | Is a | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier |  | 
| Structure of inter-regional junction of occiput condyle, atlas, and axis | Is a | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier |  | 
| Cervicofacial fibrochondroma | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Contusion of head and/or neck | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Suboccipital region structure | Is a | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier |  | 
| Injury of head and/or neck | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital anomaly of first branchial cleft | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Injury of superficial nerves of head AND/OR neck | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Injury to superficial nerves of head | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 3 | 
| Local rotation flap, random pattern, to head or neck | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Local transposition flap, axial pattern, to head or neck | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Local transposition flap, random pattern, to head or neck | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Local subcutaneous pedicle island flap, myocutaneous, to head or neck | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Local subcutaneous pedicle island flap, fasciocutaneous, to head or neck | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Distant subcutaneous pedicle flap, fasciocutaneous, to head or neck | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Reconstruction of head and neck using fasciocutaneous flap | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Distant subcutaneous pedicle flap, axial pattern, to head or neck | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Distant subcutaneous pedicle flap, random pattern, to head or neck | Procedure site - Direct | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 1 | 
| Positron emission tomography with computed tomography fluorodeoxyglucose imaging of head and neck (procedure) | Procedure site - Direct | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 3 | 
| Excision of lipoma of subcutaneous tissue of head or neck | Procedure site | False | Structure of head and/or neck | Inferred relationship | Existential restriction modifier |  | 
| Traumatic injury to head and/or neck due to physical abuse | Finding site | True | Structure of head and/or neck | Inferred relationship | Existential restriction modifier | 3 |