1. From the Department of Radiology, University of New Mexico, Albuquerque, NM, 87131 (J.W.R.); Department of Radiology, University of Washington, Seattle, Wash (S.K.M., R.O., B.M., M.M.); Department of Radiology, Yale University School of Medicine, New Haven, Conn (M.R.); Department of Radiology, NYU Winthrop Hospital, Mineola, NY (D.S.K.); and Department of Radiology, Mayo Clinic, Jacksonville, Fla (D.J.D.).