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TNM and Stage Groupings > Ampulla of Vater
Ampulla of Vater
Primary Tumor (T)
| T Category |
Stage Category Definitions |
| TX |
Primary tumor cannot be assessed |
| T0 |
No evidence of primary tumor |
| Tis |
Carcinoma in situ |
| T1 |
Tumor limited to ampulla of Vater or sphincter of Oddi |
| T2 |
Tumor invades duodenal wall |
| T3 |
Tumor invades pancreas |
| T4 |
Tumor invades peripancreatic soft tissues or other adjacent organs or
structures other than pancreas |
Regional Lymph Nodes (N)
| N Category |
Stage Category Definitions |
| NX |
Regional lymph nodes cannot be assessed |
| N0 |
No regional lymph node metastasis |
| N1 |
Regional lymph node metastasis |
Distant Metastasis (M)
| M Category |
Stage Category Definitions |
| M1 |
Distant metastasis |
No distant metastasis (no pathologic M0; use clinical M to complete stage group)
Anatomic Stage/Prognostic Groups
| Stage |
T |
N |
M |
| 0 |
Tis |
N0 |
M0 |
| IA |
T1 |
N0 |
M0 |
| IB |
T2 |
N0 |
M0 |
| IIA |
T3 |
N0 |
M0 |
| IIB |
T1 |
N1 |
M0 |
| IIB |
T2 |
N1 |
M0 |
| IIB |
T3 |
N1 |
M0 |
| III |
T4 |
Any N |
M0 |
| IV |
Any T |
Any N |
M1 |
