1. From the Department of Radiology, Baylor University Medical Center, American Radiology Associates, 712 N Washington Ave, Dallas, TX 75246 (S.D.R., M.S., Z.S.); Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (K.M.R.); and Department of Radiology, Beth Israel Deaconess Medical Center, Boston, Mass (M.D.C.F., V.M.D.).