| Outbound Relationships | Type | Target | Active | Characteristic | Refinability | Group | Values | 
| Metastasis to heart of unknown primary | Is a | Metastatic malignant neoplasm to heart | false | Inferred relationship | Some |  |  | 
| Metastasis to heart of unknown primary | Pathological process | Malignant neoplastic process | false | Inferred relationship | Some | 1 |  | 
| Metastasis to heart of unknown primary | Finding site | Ill-defined topographic site | false | Inferred relationship | Some |  |  | 
| Metastasis to heart of unknown primary | Associated morphology | Malignant neoplasm, primary | false | Inferred relationship | Some |  |  | 
| Metastasis to heart of unknown primary | Associated morphology | Neoplasm, metastatic | false | Inferred relationship | Some | 2 |  | 
| Metastasis to heart of unknown primary | Finding site | Respiratory organ | false | Inferred relationship | Some |  |  | 
| Metastasis to heart of unknown primary | Finding site | Intrathoracic organ | false | Inferred relationship | Some | 1 |  | 
| Metastasis to heart of unknown primary | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Some | 2 |  | 
| Metastasis to heart of unknown primary | Associated morphology | Malignant neoplasm of primary, secondary, or uncertain origin | false | Inferred relationship | Some | 1 |  | 
| Metastasis to heart of unknown primary | Finding site | Heart structure | false | Inferred relationship | Some | 1 |  | 
| Metastasis to heart of unknown primary | Finding site | Heart structure | false | Inferred relationship | Some | 1 |  | 
| Metastasis to heart of unknown primary | Pathological process | Secondary malignant neoplastic process | false | Inferred relationship | Some | 2 |  | 
| Metastasis to heart of unknown primary | Pathological process | Neoplastic process | false | Inferred relationship | Some |  |  | 
| Metastasis to heart of unknown primary | Finding site | Structure of respiratory system (body structure) | false | Inferred relationship | Some | 1 |  | 
| Metastasis to heart of unknown primary | Associated morphology | Neoplasm, metastatic | false | Inferred relationship | Some | 2 |  | 
| Metastasis to heart of unknown primary | Associated morphology | Neoplasm, metastatic | false | Inferred relationship | Some | 2 |  | 
| Metastasis to heart of unknown primary | Associated morphology | Neoplasm, metastatic | false | Inferred relationship | Some | 2 |  | 
| Metastasis to heart of unknown primary | Associated morphology | Neoplasm, metastatic | false | Inferred relationship | Some | 1 |  | 
| Metastasis to heart of unknown primary | Associated morphology | Neoplasm, metastatic | false | Inferred relationship | Some | 1 |  | 
| Metastasis to heart of unknown primary | Finding site | Heart structure | false | Inferred relationship | Some | 1 |  | 
| Metastasis to heart of unknown primary | Associated morphology | Neoplasm, metastatic | false | Inferred relationship | Some | 2 |  | 
| Metastasis to heart of unknown primary | Finding site | Structure of respiratory system and/or intrathoracic structure (body structure) | false | Inferred relationship | Some | 2 |  |