An indication of the additional Ann Arbor Staging System stage designation based on extranodal involvement.
Note: National Code 'E' should be reported if there is involvement of a single extranodal site that directly adjoins or is next to the known nodal group. Otherwise the field should be omitted.
National Codes:
| E | E (extranodal involvement) |
This attribute is also known by these names:
| Context | Alias |
|---|---|
| plural | ANN ARBOR EXTRANODALITY INDICATORS |