1. From the Department of Radiology, University of Utah, 30 North 1900 East, #1A71, Salt Lake City, UT 84132 (M.R., J.D.O., A.M.S.); Department of Radiology, Mayo Clinic, Scottsdale, Ariz (C.M.); Department of Radiology, Indiana University School of Medicine, Indianapolis, Ind (K.S.); and Department of Radiology, MD Anderson Cancer Center, Houston, Tex (K.M.E.).