Umberto G Rossi1, Maurizio Cariati2. 1. Department of Diagnostic Sciences - Division Radiology and Interventional Radiology, San Carlo Borromeo Hospital, Via Pio II, 3; Milano, 20153, Italy urossi76@hotmail.com. 2. Department of Diagnostic Sciences - Division Radiology and Interventional Radiology, San Carlo Borromeo Hospital, Via Pio II, 3; Milano, 20153, Italy.