Table 2: ANN-ARBOR staging system.
| Stage | Definition |
| I | Disease in single lymph node or lymph node region |
| II | Disease in two or more lymph node regions on same side of diaphragm |
| III | Disease in lymph node regions on both sides of the diaphragm |
| IV | Disease is widespread, by hematogenic route, including multiple involvement at one or more extranodal sites |
| E | Extranodal invasion by contiguity |
| X | Large tumor (diameter > 10 cm mediastinal-thoracic ratio > 1/3) |
| B | With symptoms (weight-loss > 10%, sweats, fever) |