Cap Polyposis: A Rare Cause of Rectal Bleeding

1Department of Gastroenterology and Hepatology, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, 361003, China. 2Endoscopy Center, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, 361003, China. 3The School of Clinical Medicine, Fujian Medical University, Fuzhou, 350004, China. aCorrespondence to: Wei-Feng Huang, MD. Department of Gastroenterology and Hepatology, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, 361003, China; E-mail: [email protected]. ORCID: 0000-0002-9755-7299. *Hai-Xing Wang, MD. Endoscopy Center, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, 361003, China; E-mail: [email protected]