Fig. 3
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40792-021-01193-9/MediaObjects/40792_2021_1193_Fig3_HTML.jpg)
Patient 2. a Endoscopic findings. The widespread flat lesion in the middle esophagus was detected at 35–40 cm from the upper incisors, and suspected submucosal invasion. b Narrow band imaging
Patient 2. a Endoscopic findings. The widespread flat lesion in the middle esophagus was detected at 35–40 cm from the upper incisors, and suspected submucosal invasion. b Narrow band imaging