1. From the Department of Radiology and Imaging Sciences (A.M.S., M.R., R.R.H., A.M.K., J.D.O.) and Department of Pathology (M.E.S.), University of Utah, 30 North 1900 East, #1A71, Salt Lake City, UT 84132; Department of Radiology, University of Texas MD Anderson Cancer Center, Houston, Tex (K.M.E.); Department of Diagnostic Radiology, Oregon Health & Science University, Portland, Ore (B.R.F.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (C.O.M.).