The purpose of this study is evaluation of the safety and the efficacy of transanal total mesorectal excision in difficult case. Difficult case is defined as below; \- If any one of the following (1 or 2 or 3) 1. BMI: 30 or more 2. Tumor size: more than 7cm in long diameter 3. CRM: mesorectal fascia involvement or less than 1 mm on MRI
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
TME quality & circumferential resection margin (CRM)
Timeframe: the day of surgery