1. From the Department of Diagnostic Radiology (S.L., C.F.), Department of Surgery, Division of Cardiothoracic Surgery (C.B., A.M.), and Department of Pathology (D.S.), Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239-3098; and Department of Radiology, University of California, Davis, Sacramento, Calif (B.G.).