1. From the Department of Diagnostic and Interventional Radiology and Neuroradiology (M.B., G.S., F.Z.T.), Department of Radiology (E.T.), and Department of Pediatric Hematology Oncology (T.M., A.T.), Fondazione IRCCS Policlinico San Matteo, Viale Golgi 19, 27100 Pavia, Italy.