[1] Univ Toronto, Hosp Sick Children, Div Neurosurg, Toronto, ON, Canada
[2] Univ Toronto, Hosp Sick Children, Div Neuroradiol, Toronto, ON, Canada
[3] Univ Dalhousie, IWK Hlth Ctr, Dept Diagnost Imaging, Halifax, NS, Canada
[4] Univ Dalhousie, QE Hlth Sci Ctr 2, Div Neurosurg, Halifax, NS, Canada
[5] King Abdulaziz Univ, Div Neurosurg, Jeddah, Saudi Arabia