1. From the Departments of Radiology (M.A.R., N.B.A., A.A.B., A.K.D.) and Surgery (R.J.C.), University of Pittsburgh Medical Center, 200 Lothrop St, Radiology Suite 200, East Wing E2051B, Pittsburgh, PA 15213; and Department of Surgery, Cleveland Clinic Foundation, Cleveland, Ohio (K.M.A., G.C.).