1. From the Departments of Angio-Cardio-Neurology (G.S., A.N., A.M., V.S., G.F., B.T., G.L.) and of Neuro-Radiology (V.C., C.C.), IRCCS Neuromed, Pozzilli (IS), and the Neuro-Radiology Section (C.C.) and Department of Experimental Medicine and Pathology (G.L.), Università La Sapienza, Rome, Italy.