1. From the Department of Radiology, Columbia University, New York, NY (L.L.); Departments of Surgery (A.M.L., K.L.) and Radiology (K.J.F., J.L.), University of California San Diego, 200 W Arbor Dr, San Diego, CA 92103-8756; Department of Radiology, University of California San Francisco, San Francisco, Calif (Z.J.W.); and Department of Radiology, Johns Hopkins University, Baltimore, Md (I.R.K.).