Se Hwan Kwon1, Hyung Joon Ahn2, Joo Hyeong Oh3. 1. Department of Radiology, College of Medicine, Kyung Hee University, Kyung Hee University Hospital, Seoul, Republic of Korea kwon98@khu.ac.kr. 2. Department of Surgery, College of Medicine, Kyung Hee University, Kyung Hee University Hospital, Seoul, Republic of Korea. 3. Department of Radiology, College of Medicine, Kyung Hee University, Kyung Hee University Hospital, Seoul, Republic of Korea.