Table 1 Clinical staging of Mason
From: Transanal endoscopic microsurgery in treatment of rectal adenomas and T1 low-risk carcinomas
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 |