Yi-Shan Tsai1, Yen-Rei Chen1, Li-Wen Chen2. 1. From the Departments of Diagnostic Radiology (Y.-S.T., Y.-R.C.) and Pediatrics (L.-W.C.), National Cheng Kung University Hospital and College of Medicine, Tainan, Taiwan. 2. From the Departments of Diagnostic Radiology (Y.-S.T., Y.-R.C.) and Pediatrics (L.-W.C.), National Cheng Kung University Hospital and College of Medicine, Tainan, Taiwan. muffychen@gmail.com.