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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