[1] CHUM Res Ctr, Intervent Neuroradiol Res Lab, Montreal, PQ, Canada
[2] Ctr hosp Univ Montreal CHUM, Dept Radiol, Serv Neuroradiol, Montreal, PQ, Canada
[3] Univ Alberta Hosp, Mackenzie Hlth Sci Ctr, Dept Surg, Div Neurosurg, Edmonton, AB, Canada
[4] Ctr hospitalier Univ Montreal CHUM, Dept Radiol, Room D03 5462b, Montreal, PQ H2X 0C1, Canada