Safety of first surveillance colonoscopy at 12 months after piecemeal endoscopic mucosal resection of large non-pedunculated colorectal lesions

After piecemeal endoscopic mucosal resection (pEMR) of nonpedunculated colorectal lesions ≥ 20 mm, guidelines recommend first endoscopic surveillance at 6 months. However, initial surveillance at 12 months may be adequate for selected low-risk lesions, and could save the cost, risk and inconvenience of one surveillance examination.