1 Department of Diagnostic and Interventional Neuroradiology, E.O. Ospedali Galliera, Mura delle Cappuccine 14, 16128 Genova, Italy. Electronic address: romano.nicola@live.it.
2 Department of Diagnostic and Interventional Neuroradiology, E.O. Ospedali Galliera, Mura delle Cappuccine 14, 16128 Genova, Italy.