1 From the Departments of Radiology (M.M.R., P.D.P.) and Pathology (R.V.P.), São João University Hospital, Alameda Prof. Hernâni Monteiro, 4200-319 Porto, Portugal; Department of Radiology, Wellington Hospital, Wellington, New Zealand, and Artibiotics, Wellington, New Zealand (C.K.); and Department of Medical Imaging, University of Toronto, Toronto, Ontario, Canada, and Department of Radiology, CDI, Hospital Clínic Barcelona, Barcelona, Spain (A.P.C.).