Charlotte E Dujardin1, Harry Cloft2, Eelco F M Wijdicks3. 1. KU Leuven, Leuven, Belgium. 2. Department of Radiology, Mayo Clinic, Rochester, MN, 55905, USA. 3. Division of Neurocritical Care and Hospital Neurology, Mayo Clinic, Rochester, MN, 55905, USA. wijde@mayo.edu.