Affiliation: | (1) Department of Neurosurgery, C. H. U. Sart Tilman, B-4000 Liège, Belgium;(2) Department of Radiology, C. H. U. Sart Tilman, B-4000 Liège, Belgium;(3) Department of Radiology, C. H. U. Saint Luc, Brussels, Belgium;(4) Department of Neurology, C. H. U. Sart Tilman, B-4000 Liège, Belgium |