1. From the Department of Radiology, Tufts University School of Medicine, Boston, MA (J.F.P.); Department of Neurology, University of Miami, FL (R.L.S.); Division of Cardiology (W.S.P.) and Department of Medicine (W.S.P., D.V.), Johns Hopkins University School of Medicine, Baltimore, MD; Department of Neurology, Wake Forest School of Medicine, Winston-Salem, NC (M.K.A.); and Department of Radiology, Saint Elizabeth’s Medical Center, Brighton, MA (D.H.O.).