1. From the Departments of Radiology (Y.C., J.J., J.K., Y.N., N.Y.S., K.J.A., B.S.K.) and Neurosurgery (S.S.J.), Seoul Saint Mary’s Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul 06591, Korea; and Department of Radiology, Eunpyeong Saint Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea (Y.N.).