1. From the Departments of Radiology (O.T.H., S.C.B., M.A.O., H.H.C.), Pathology (R.M.G.), Interventional Radiology (N.F.), and Hepatology and Liver Transplantation (N.M.), University of California San Francisco, 513 Parnassus Ave, Rm S257, San Francisco, CA 94143; and Department of Radiology, University of California San Diego, San Diego, Calif (K.J.F.).