Chia-Ying Lin1, Chao-Chun Chang2, Ming-Tsung Chuang3. 1. Department of Diagnostic Radiology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Taiwan. 2. Department of Surgery, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Taiwan. 3. Department of Diagnostic Radiology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Taiwan. Electronic address: u8501122@gmail.com.