1 Neuroradiology Unit, Department of Biomedicine and Prevention, University of Rome "Tor Vergata", Viale Oxford 81, Rome 00133, Italy; San Raffaele Cassino, FR, Italy.
2 Neuroradiology Unit, Department of Biomedicine and Prevention, University of Rome "Tor Vergata", Viale Oxford 81, Rome 00133, Italy. Electronic address: francescadigiuliano@msn.com.
3 Diagnostic Imaging Unit, Department of Biomedicine and Prevention, University of Rome "Tor Vergata", Viale Oxford 81, Rome 00133, Italy.