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. 2020 Apr 2;70(1):67–75. doi: 10.1136/gutjnl-2019-319631

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Representative images of target lesions. (A and B) A slightly elevated lesion in the middle third of the stomach is shown (arrowheads). The final histopathological diagnosis was well-differentiated adenocarcinoma, confined to the mucosa. (A) On white light imaging (WLI), the lesion appears as a whitish area with irregular margins and an irregular surface. (B) On second-generation narrow band imaging (2G-NBI), the lesion appears as a brownish area with irregular margins and an irregular surface. (C and D) A depressed lesion in the upper third of the stomach is shown (arrowheads). The final histopathological diagnosis was well-differentiated adenocarcinoma, confined to the mucosa. (C) On WLI, the lesion appears as a reddish area with irregular margins and an irregular surface. (D) On 2G-NBI, the lesion appears as a brownish area with irregular margins and an irregular surface. (E, F) A flat lesion in the upper third of the stomach is shown (arrowheads). The final histopathological diagnosis was moderately differentiated adenocarcinoma, confined to the mucosa. (E) On WLI, the lesion appears as a reddish area with irregular discoloration. (F) On 2G-NBI, the lesion appears as a brownish area with irregular discoloration.