1. From the Departments of Radiology (K.M., M.M.H.) and Pathology (J.W.C.), Brigham and Women’s Hospital, 75 Francis St, Boston, MA 02115; Department of Radiology, Mayo Clinic Scottsdale, Scottsdale, Ariz (C.O.M.); Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, Mo (S.B.); and Department of Radiology, University of Texas Health Science Center, San Antonio, Tex (V.S.K.).