1. From the Department of Radiology, SUNY Downstate Medical Center, University Hospital of Brooklyn, 450 Clarkson Ave, Brooklyn, NY 11203 (V.K.K., V.V., Z.A.C., D.L.R.); Department of Radiology, University of California Davis Health System, Sacramento, Calif (M.B.); and Department of Radiology, University of Iowa Hospital and Clinics, Iowa City, Iowa (W.R.K.S.).