1. From the Department of Radiology, Division of Cardiothoracic Imaging, University of Texas Medical Branch at Galveston, 301 University Blvd, Galveston, TX 77550 (A.M., D.M.P.); and Department of Radiology, Division of Cardiothoracic Imaging, University of Texas MD Anderson Cancer Center, Houston, Tex (S.B.C.).