1. From the Divisions of Abdominal Radiology (M.S.M., W.J.W., K.G.U., E.B.S.) and Musculoskeletal Radiology (M.S.M., Y.M., C.M.Y., K.G.U.), Department of Radiology, University of Michigan Health System, 1500 E Medical Center Dr, UH B1-D502, Ann Arbor, MI 48109.