1. From the Interventional Radiology Service, Memorial Sloan-Kettering Cancer Center, New York, NY (A.R.D.); Division of Cardiovascular Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (A.M.P.); and Division of Interventional Radiology, Mayo Clinic, 5777 E Mayo Blvd, Phoenix, AZ 85054 (S.N., R.O.).