Idiopathic Myointimal Hyperplasia of Mesenteric Veins: A Rare Cause of Treatment Refractory Colitis: 1546. (October 2019) - Oruganti, Poornima; Awan, Rehmat Ullah; Sugimoto, Matthew; Tey, Kai Rou; Nunez‐Herrero, Laura; Ding, Xianzhong; Ma, Yihong; Abegunde, Ayokunle T.