fig4

Figure 4. Large rectal lesions and stricture risk: (A) the circumferential extension of the rectal lesion was > 75%; (B) the lesion was carefully resected with out adverse event; (C, D) the ulcer bed and specimen after ESD; (E) the stricture was treated by endoscopic balloon dilation; and (F) the lumen after three years. ESD: Endoscopic submucosal dissection.