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Clinical staging of Mason
| Stage | Definition | Pathological correlation |
|---|---|---|
| Clinical Stage 0 |
No rough parts of tumor |
|
| Clinical Stage I |
Freely mobile |
Submucosa |
| Clinical Stage II |
Mobile |
Muscularis propria |
| Clinical Stage III |
Tethered mobility |
Perirectal fat |
| Clinical Stage IV | Fixed/tethered fixation | Adjacent structures |
