Kejal Kantarci1, Gregory A Jicha2. 1. From the Department of Radiology (K.K.), Division of Neuroradiology, Mayo Clinic, Rochester, MN; and Department of Neurology (G.J.), University of Kentucky, Lexington. kantarci.kejal@mayo.edu. 2. From the Department of Radiology (K.K.), Division of Neuroradiology, Mayo Clinic, Rochester, MN; and Department of Neurology (G.J.), University of Kentucky, Lexington.