1. From the Department of Radiology, Ochsner Clinic Foundation, 1514 Jefferson Hwy, New Orleans, LA 70121; and University of Queensland School of Medicine, Ochsner Clinical School, New Orleans, La (E.I.B.); Department of Radiology and Biomedical Imaging, Yale University School of Medicine, New Haven, Conn (T.R.G.); and Department of Radiology, Mayo Clinic, Rochester, Minn (C.E.B.).