Pierleone Lucatelli1, Boris Guiu2. 1. Department of Radiology, Vascular and Interventional Radiology Unit, Sapienza University of Rome, Rome, Italy. 2. Department of Radiology, St-Eloi University Hospital, 80 avenue Augustin Fliche, 34295, Montpellier, France. B-guiu@chu-montpellier.fr.