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Copyright ©The Author(s) 2023.
World J Gastroenterol. May 7, 2023; 29(17): 2600-2615
Published online May 7, 2023. doi: 10.3748/wjg.v29.i17.2600
Table 1 The Japan Narrow-band Imaging Expert Team classification[8]

Type 1
Type 2A
Type 2B
Type 3
Vessel patternInvisibleRegular caliber, regular distribution (meshed/spiral pattern)Variable caliber, irregular distributionLoose vessel areas, interruption of thick vessels
Surface patternRegular dark or white spots, similar to surrounding normal mucosaRegular (tubular/branched/papillary)Irregular or obscureAmorphous areas
Suspected pathologyHyperplastic polyp/sessile serrated polypLow grade intramucosal neoplasiaHigh grade intramucosal neoplasia/shallow submucosal invasive cancerDeep submucosal invasive cancer