Fig. 3

By magnifying endoscopy with narrow band imaging (NBI), the surface pattern was seen to be slightly irregular, but microvessels had a regular diameter and distribution in the margin of the lesion (a). However, in the central part of the lesion, irregularity in surface pattern and form as well as in the diameter and distribution of microvessels was seen; however, due to mucus, avascular areas were also seen (b)