1. From the Department of Radiology, University of British Columbia, St. Paul’s Hospital Radiology, Vancouver, Canada (G.T., J.A.L.); Department of Radiology, St. Vincent’s University Hospital, Elm Park, Dublin D4, Ireland (D.T.R., D.J.M., J.D.D.); and School of Medicine, University College Dublin, Dublin, Ireland (D.J.M., J.D.D.).