Endoscopic findings after ESD without steroid injection. (A) A circumferential mucosal defect immediately after the ESD. (B) One week after the ESD, the ulcer bed is mostly covered with granulation tissue. (arrow, Gr: granulation tissue) (C) Two weeks after the ESD, the stricture of the ulcer site is remarkable. (D) Three weeks after the ESD, the stricture shows a pinhole-like appearance, the surface of which is completely covered with the regenerated epithelium.