Sigmoid Colon Cancer in a Juvenile Patient Without a Family History of Colorectal Cancer

An 18-year-old woman presented with intermittent hematochezia. She had no previous history or family history of cancer. A colonoscopy showed a reddish 5-mm polyp in the sigmoid colon (Figure A). Narrow-band imaging showed a brownish area on the head of the polyp (Figure B), suggestive of NICE type 2. However, the surface and vessel pattern were indicative of NICE type 1 (Figure C). Therefore, we suspected a hyperplastic polyp. However, because of the overlapping features of NICE type 1 and type 2, the optical diagnosis of the polyp would be low-confident.

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