Umberto G Rossi1, Pierluca Torcia2, Maurizio Cariati2. 1. Department of Diagnostic Science - Radiology and Interventional Radiology Unit, ASST Santi Paolo and Carlo Hospital, Milano, Italy urossi76@hotmail.com. 2. Department of Diagnostic Science - Radiology and Interventional Radiology Unit, ASST Santi Paolo and Carlo Hospital, Milano, Italy.