Status: current, Sufficiently defined by necessary conditions definition status (core metadata concept). Date: 31-Jan 2002. Module: SNOMED CT core
Descriptions:
| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group |
| Congenital absence of azygos vein | Is a | False | Congenital absence of superior vena cava | Inferred relationship | Some | |
| Absent bridging vein | Is a | True | Congenital absence of superior vena cava | Inferred relationship | Some | |
| Absent right superior vena cava | Is a | True | Congenital absence of superior vena cava | Inferred relationship | Some |
This concept is not in any reference sets