1 Department of Radiology, HFR Fribourg-Hôpital Cantonal, Fribourg, Switzerland; Department of Urology, Inselspital, University Hospital, Bern, Switzerland. Electronic address: harriet.thoeny@h-fr.ch.
2 Department of Radiology, Hospital Bicêtre-P. Brousse, Le Kremlin-Bicêtre, France; IR4 M, University Paris Sud, Paris, France.
3 Department of Anatomie-Pathologique Hôpital Tenon HUEP, Sorbonne University, Paris, France.
4 Department of Urology, Inselspital, University Hospital, Bern, Switzerland.