Ulceration of the Pre‐Pouch Ileum in Patients With Ulcerative Colitis Following Proctocolectomy With Ileal Pouch‐Anal Anastomosis: An Analysis of Pouchoscopies From 272 Patients: 657. (October 2019) - Ollech, Jacob E.; Akyiama, Shintaro; Rai, Victoria; Cohen, Russell D.; Hurst, Roger D.; Hyman, Neil H.; Dalal, Sushila R.; Rubin, David T.