Fig. 2

A The diverticulum neck stained with ICG is visualized under NIR fluorescence. B The neck was resected with an endoscopic purple stapler exactly parallel to the longitudinal axis of the esophagus with the assistance of ICG. C The diverticulum was excised, and ICG-stained diverticulum walls and neck were seen. The mucosa of the esophagus is stained (yellow arrow), and the normal muscularis is not (blue arrow)