Gabriel Zada, MD, MSDepartment of Neurological SurgeryKeck School of MedicineUniversity of Southern California 1975 Zonal Avenue Los Angeles, CA 90033, USAgzada@usc.eduM. Beatriz S. Lopes, MD, PhD Department of Pathology (Neuropathology)University of Virginia School of Medicine1215 Lee Street, Room 3060–HEPCharlottesville, VA 22908, USAmsl2e@virginia.edu Srinivasan Mukundan, Jr, PhD, MDDepartment of RadiologyBrigham and Women’s Hospital75 Francis StreetBoston, MA 02115 USAsmukundan@partners.orgEdward Laws, Jr, MDDepartment of NeurosurgeryBrigham and Women’s HospitalHarvard Medical School15 Francis StreetBoston, MA 02115, USA elaws@partners.org