Jonathan C Baker1, Travis J Hillen2, Jennifer L Demertzis2. 1. Musculoskeletal Section, Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO. Electronic address: bakerjo@mir.wustl.edu. 2. Musculoskeletal Section, Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO.