1. From the Departments of Radiology (M.S.B., S.H.L., S.U.S., W.K.M.) and Pathology (H.S.R.), Seoul National University College of Medicine and Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 03080, Korea; and Department of Radiology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea (A.J.C.).