1 From the Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University, 600 N Wolfe St, Phipps B-100, Baltimore, MD 21287 (D.A.L.); Department of Radiology, Medical University Hospital of Gdansk, Gdansk, Poland (J.N.); Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, Ark (G.K.V.); Artibiotics, Wellington, New Zealand, and Department of Radiology, Wellington Regional Hospital, Te Whatu Ora, Wellington, New Zealand (C.K.); and Department of Neuroradiology, West Virginia University, Morgantown, WV (J.S.C.).