This study is a prospective randomized study to evaluate the role of NBI for improving complete resection rate of sessile serrated adenoma/polyp (SSA/P). The authors will enroll consecutive patients who underwent colon polypectomy for SSA/P during colonoscopy. The authors will inspect resection margin of SSA/P using white light endosocpy (WLE) or NBI after randomization for the evaluation of remnant lesion. Additional resection will be performed for suspicious of remnant lesion, and then 4 biopsies from 4 quadrants of margin for evaluation of complete resection.
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the detection rate of remnant lesion,
Timeframe: 2 years after IRB
The diagnosis rate of SSA/P in the remnant tissue
Timeframe: 2 years after IRB
Incomplete resection rate of SSA/P
Timeframe: 2 years after IRB