1. From the Mallinckrodt Institute of Radiology, 510 S. Kingshighway Blvd, Campus Box 8131, St Louis, MO 63110 (C.A.R., S.R.M., K.L.R., S.B.); Department of Radiology, Hospital Cruz Roja, Córdoba, Spain (J.B.); and Department of Radiology, Weill Medical College, New York–Presbyterian Hospital, New York, NY (D.B.G.).