Chang-Il Kwon1, Tae Hoen Kim2, Kyoung Ah Kim3. 1. Digestive Disease Center, CHA Bundang Medical Center, CHA University, Seongnam, Korea. 2. Department of Pathology, CHA Bundang Medical Center, CHA University, Seongnam, Korea. 3. Department of Radiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea.