1. From the Zeenat Qureshi Stroke Research Center (F.S., G.V., M.Z.M., M.F.S., R.A.T., A.I.Q.), University of Minnesota, Minneapolis; the Section of Neuroradiology (J.C.C.), University of Iowa, Iowa City; and Our Lady of Lourdes Regional Medical Center (J.C.W.), Lafayette, La.