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TNM and Stage Groupings > Intrahepatic Bile Duct
Intrahepatic Bile Duct
Primary Tumor (T)
| T Category |
Stage Category Definitions |
| TX |
Primary tumor cannot be assessed |
| T0 |
No evidence of primary tumor |
| Tis |
Carcinoma in situ (intraductal tumor) |
| T1 |
Solitary tumor without vascular invasion |
| T2a |
Solitary tumor with vascular invasion |
| T2b |
Multiple tumors, with or without vascular invasion |
| T3 |
Tumor perforating the visceral peritoneum or involving the local extra hepatic
structures by direct invasion |
| T4 |
Tumor with periductal invasion |
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 present |
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 |
| I |
T1 |
N0 |
M0 |
| II |
T2 |
N0 |
M0 |
| III |
T3 |
N0 |
M0 |
| IVA |
T4 |
N0 |
M0 |
| IVA |
Any T |
N1 |
M0 |
| IVB |
Any T |
Any N |
M1 |
