Paris staging system (TNMB) for primary gastrointestinal tract lymphomas (80)
| Stage of disease | Traits of stage |
|---|---|
| Tx | Lymphoma extent unspecified |
| T0 | No evidence of lymphoma |
| T1 | Lymphoma confined to the mucosa/submucosa |
| T1m | Lymphoma confined to the mucosa |
| T1sm | Lymphoma confined to the submucosa |
| T2 | Lymphoma infiltrates muscularis propria or subserosa |
| T3 | Lymphoma penetrates serosa without invading adjacent structures |
| T4 | Lymphoma infiltrates adjacent structures or organs |
| Nx | Nodal involvement not assessed |
| N0 | No evidence of lymph node involvement |
| N1 | Involvement of regional lymph nodes (for GL: perigastric nodes, as well as those located along the splenic, the common hepatic and the left gastric arteries) |
| N2 | Involvement of intra-abdominal lymph nodes beyond the regional area |
| N3 | Involvement of extra-abdominal nodes |
| Mx | Dissemination not assessed |
| M0 | No evidence of extranodal dissemination |
| M1 | Noncontinuous involvement of separate sites in the GI tract (i.e., stomach and rectum) |
| M2 | Noncontinuous involvement of other tissues or organs |
| Bx | Involvement of bone marrow not assessed |
| B0 | No evidence of bone marrow involvement |
| B1 | Lymphomatous infiltration of the bone marrow |
GI = gastrointestinal; GL = gastric lymphoma.