1. From the Department of Radiology, Neuroradiology Section, University of Arkansas for Medical Sciences, Little Rock, Ark (S.V.); Department of Clinical Imaging, Hamad General Hospital (L.A.), and Department of Neuroradiology, Neuroscience Institute (M.A., A.H.E.B.), Hamad Medical, PO Box 3050, Alsadd, Doha, Qatar; and Department of Clinical Radiology, Weill Cornell Medicine, Doha, Qatar (A.H.E.B.).