B Harding1, A Vossough2, E Goldberg3, M Santi1. 1. Department of Pathology and Lab Medicine (Neuropathology), Children's Hospital of Philadelphia and the Perelman School of Medicine University of Pennsylvania, Philadelphia, PA, USA. 2. Department of Radiology, Children's Hospital of Philadelphia and the Perelman School of Medicine University of Pennsylvania, Philadelphia, PA, USA. 3. Department of Neurology, Children's Hospital of Philadelphia and the Perelman School of Medicine University of Pennsylvania, Philadelphia, PA, USA.