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1 Department of Radiology, service of Neuroradiology, Centre hospitalier de l'Université de Montréal (CHUM), Montreal, Quebec, Canada.
2 Division of Neurosurgery, Department of Surgery, University of Alberta Hospital, Mackenzie Health Sciences Centre, 8440 112St NW, Edmonton, Alberta, Canada. Electronic address: jean.raymond@umontreal.ca.
1 Department of Radiology, service of Neuroradiology, Centre hospitalier de l'Université de Montréal (CHUM), Montreal, Quebec, Canada.
2 Division of Neurosurgery, Department of Surgery, University of Alberta Hospital, Mackenzie Health Sciences Centre, 8440 112St NW, Edmonton, Alberta, Canada. Electronic address: jean.raymond@umontreal.ca.