Table 1 AJCC TNM Rectal Cancer Staging
From: The role of endoscopic ultrasound in the evaluation of rectal cancer
TX | Primary tumor can not be assessed. |
T0 | No primary tumor identified. |
Tis | Carcinoma in situ (tumor limited to mucosa). |
T1 | Involvement of submucosa, but no penetration through muscularis propria. |
T2 | Invasion into, but not penetration through, muscularis propria. |
T3 | Penetration through muscularis propria into subserosa (if present), or pericolic fat, but not into peritoneal cavity or other organs. |
T4 | Invasion of other organs or involvement of free peritoneal cavity. |
NX | Nodal metastasis can not be assessed. |
N0 | No nodal metastasis. |
N1 | 1–3 pericolic/perirectal nodes involved. |
N2 | 4 or more pericolic/perirectal nodes involved. |
MX | Distant metastasis can not be assessed. |
M0 | No distant metastases. |
M1 | Distant metastases |