1. From the Department of Radiology, Division of Abdominal Imaging and Intervention (P.B.S., L.C.C., N.I.S., C.A.S., P.M.B., V.M.L., S.G.S.) and Division of Nuclear Medicine (C.K.K., V.H.G.), Brigham and Women’s Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02115.