1. From the Mallinckrodt Institute of Radiology, 510 S Kingshighway Blvd, St Louis, MO 63110 (K.M.M., K.S., C.A.R.); Department of Radiology, Brigham and Women’s Hospital, Boston, Mass (M.M.H.); Department of Radiology, Duke University, Durham, NC (T.S.H.); and Department of Pathology & Immunology (C.Y.L.) and Department of Pulmonology (A.S.), Washington University, St Louis, Mo.