Figure 4

Representative endoscopic and histological images of the porcine ET. (a) Mild secretion (arrow head) around the T-SEMS (arrows) at 4 weeks. (b) Relatively severe secretion (arrow heads) was observed around the C-SEMS (arrows) at 4 weeks after the stent placement. (c,d) Histological images show significantly higher percentage of tissue hyperplasia in the distal portion of the C-SEMS group than that of the T-SEMS group. Histological results of the (e) percentage of tissue hyperplasia and (f) degree of inflammatory cell infiltration at 4 weeks after the stent placement in the T-SEMS and C-SEMS groups. T-SEMS tapered self-expandable metallic stent, C-SEMS conventional self-expandable metallic stent.