Division of Diagnostic and Therapeutic Neuroradiology, St. Michael's Hospital, Toronto, Ontario, Canada

Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts

Department of Medical Imaging, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada

Department of Neurosurgery, University of Alabama at Birmingham, Alabama

Department of Neurosurgery, State University of New York at Buffalo, Buffalo, New York

Department of Interventional Neuroradiology, University of Florence, Florence, Italy

Department of Diagnostic and Therapeutic Neuroradiology, Toulouse University Hospital, Toulouse, France

Department of Neurosurgery, Yale School of Medicine, New Haven, Connecticut

Correspondence: Adam A. Dmytriw, MD, MSc, Department of Medical Imaging, University of Toronto, 263 McCaul St, Toronto, ON M5T 1W5. E-mail: [email protected]

Received July 27, 2017

Accepted December 20, 2017