| Outbound Relationships | Type | Target | Active | Characteristic | Refinability | Group | Values | 
| Malignant tumor of Eustachian tube | Is a | Malignant tumor of middle ear and mastoid | false | Inferred relationship | Existential restriction modifier |  |  | 
| Malignant tumor of Eustachian tube | Is a | Tumor of Eustachian tube | true | Inferred relationship | Existential restriction modifier |  |  | 
| Malignant tumor of Eustachian tube | Pathological process | Neoplastic process | false | Inferred relationship | Existential restriction modifier |  |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant tumor of Eustachian tube | Pathological process | Malignant neoplastic process | false | Inferred relationship | Existential restriction modifier |  |  | 
| Malignant tumor of Eustachian tube | Finding site | Ill-defined topographic site | false | Inferred relationship | Existential restriction modifier |  |  | 
| Malignant tumor of Eustachian tube | Finding site | Anatomical structure | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Neoplasm | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant tumor of Eustachian tube | Finding site | Structure of pharyngotympanic tube | true | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant tumor of Eustachian tube | Is a | Tumor of middle ear and mastoid | false | Inferred relationship | Existential restriction modifier |  |  | 
| Malignant tumor of Eustachian tube | Finding site | Mastoid structure | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant tumor of Eustachian tube | Finding site | Middle ear structure | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant tumor of Eustachian tube | Is a | Malignant tumor of nasopharynx | false | Inferred relationship | Existential restriction modifier |  |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant tumor of Eustachian tube | Finding site | Middle ear structure | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 1 |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Existential restriction modifier | 2 |  | 
| Malignant tumor of Eustachian tube | Is a | Malignant tumor of middle ear | true | Inferred relationship | Existential restriction modifier |  |  | 
| Malignant tumor of Eustachian tube | Associated morphology | Malignant neoplasm | true | Inferred relationship | Existential restriction modifier | 1 |  |