Cap polyposis refractory to Helicobacter pylori eradication treated with endoscopic submucosal dissection

Figure 1 Endoscopic findings of multiple inflammatory polyps. A and B: Caps of fibrinopurulent exudate from the sigmoid colon to the rectum interspersed with normal colonic mucosa; C and D: Magnifying endoscopy shows an area in the cap of amorphous fibrinopurulent exudate and tortuous and long branching crypts under the cap; E: Endoscopic ultrasonography showed significant thickening of the colonic mucosa layers.