1 From the Division of Abdominal Imaging, Department of Radiology, University of Washington, 1959 NE Pacific St, Seattle, WA 98195-7115 (S.M., A.A., C.R., P.B. B.M.); Division of Abdominal Imaging, Department of Radiology, Mayo Clinic, Jacksonville, Fla (D.D.); and Division of Abdominal Imaging, Department of Radiology, New York University, New York, NY (J.R.).