1. From the Department of Radiology, University of Washington, 1959 NE Pacific St, Seattle, WA 98195-7115 (L.N.J., S.K.M., P.B., M.M., C.A.R., B.M.); Department of Radiology, University of New Mexico, Albuquerque, NM (J.W.R.); and Department of Radiology, Vanderbilt University Medical Center, Nashville, Tenn (M.M.).