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The Japan NBI Expert Team classification. *1, if visible, the caliber in the lesion is similar to surrounding normal mucosa; *2, microvessels are often distributed in a punctate pattern and well-ordered reticular or spiral vessels may not be observed in depressed lesions; *3, deep submucosal invasive cancer may be included. This figure is licensed by John Wiley and Sons. NBI, narrow-band imaging.
