Abstract
A 60-year-old man was referred for surveillance colonoscopy 3 years after surgical resection for rectal cancer. Colonoscopy raised the possibility of a flat lesion with mucus in the transverse colon (A). Neither linked-color imaging (LCI) nor blue-light imaging (BLI) succeeded in enhancing the identification and characterization of the lesion (B, C). However, BLI after 1.7% acetic acid spray highlighted the lesion (D). The size of the polyp was 20 mm and was macroscopically diagnosed as a serrated polyp.
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