Table 5. Primary Tumor (T)a
| aReprinted with permission from AJCC: Distal bile duct. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 227-33. | |
| TX | Primary tumor cannot be assessed. |
| T0 | No evidence of primary tumor. |
| Tis | Carcinoma in situ. |
| T1 | Tumor confined to the bile duct histologically. |
| T2 | Tumor invades beyond the wall of the bile duct. |
| T3 | Tumor invades the gallbladder, pancreas, duodenum, or other adjacent organs without involvement of the celiac axis or the superior mesenteric artery. |
| T4 | Tumor involves the celiac axis or the superior mesenteric artery. |
