1 *Department of Radiology, Santobono-Pausilipon Hospital, Naples †Department of Imaging and Radiation therapy, Azienda Ospedaliera della Provincia di Lecco, Lecco ‡Section of Ultrasonography and Interventional Ultrasound, D. Cotugno Hospital, Naples §Department of Emergency Radiology, AOR San Carlo Hospital, Potenza ||Department of Radiology, University Hospital Federico II, Naples, Italy.