C Pozzessere1, K K Porter2, I R Kamel2. 1. Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins Medical Institutions, 1800 Orleans Street, Baltimore, MD 21287, USA; Department of Medical, Surgical and Neurosciences University of Siena, Viale Bracci 10, 53100 Siena, Italy. Electronic address: chiara.pozzessere@gmail.com. 2. Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins Medical Institutions, 1800 Orleans Street, Baltimore, MD 21287, USA.