Luigi Solbiati1,2, Nicolo' Gennaro3, Riccardo Muglia3. 1. Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milan, Italy. lusolbia@tin.it. 2. Department of Radiology, Humanitas Clinical and Research Hospital, Rozzano, Milan, Italy. lusolbia@tin.it. 3. Training School in Radiology, Humanitas University, Pieve Emanuele, Milan, Italy.