[1] Montpellier Univ, Gui de Chauliac Hosp, Dept Neuroradiol, Hosp Ctr, 80 Ave Augustin Fliche, F-34295 Montpellier 5, France
[2] Fdn Oftalmol Santander, Clin Ardila Lulle, Dept Neuroradiol, Clin Foscal, Bucaramanga, Colombia
[3] Med Univ Graz, Div Neuroradiol, Dept Radiol, Graz, Austria
[4] Montpellier Univ, Gui de Chauliac Hosp, Dept Neurol, Hosp Ctr, F-34295 Montpellier, France