1. From the Department of Radiology, Machida Municipal Hospital, 2-15-41 Asahi-cho, Machida, Tokyo 194-0023, Japan (Y.Y.K., N.T., M.T.); Department of Radiology, St Marianna University School of Medicine, Kawasaki, Japan (A.F., H.I.); and Department of Diagnostic Radiology, Oregon Health & Science University, Portland, Ore (J.S.).