1. From the Departments of Radiology (H.H., Y.M., M.H., H.N.) and Pathology (H.H., H.I.U.), National Cerebral and Cardiovascular Center, 5-7-1 Fujishiro-dai, Suita, Osaka, Japan; Departments of Diagnostic Radiology (F.K.), Cardiology (S.N.), and Cardiovascular Surgery (A.I.), Saitama Medical University International Medical Center, Hidaka, Japan; Department of Radiology, Tenri Hospital, Tenri, Japan (K.U.); and Department of Radiology, Kobe University, Kobe, Japan (K.S.).