Fig. 1

Endoscopic Findings. a Conventional endoscopy with WLI. A slightly depressed, discolored lesion with sharp margin was observed against non-atrophic mucosa on the anterior wall of the middle gastric body. b-e ME with BLI (b, c) and ME with LCI using indigo carmine dye spray (d, e). c and e are images with the highest power optical magnification. In the depressed area, microsurface pattern was sparse and partially absent. Microvascular pattern was irregularly irregular, that is, a variation in caliber, non-uniform shapes, and an asymmetric distribution. Both microsurface and microvascular patterns were indistinguishable from UD-EGC. WLI, white-light imaging; ME, magnifying endoscopy; BLI, Blue Laser Imaging; LCI, Linked Color Imaging; UD-EGC, undifferentiated early gastric cancer