1. From the Departments of Radiology (L.D.H., C.K.H., A.H., S.J.K.), Pulmonology (D.G.P., T.M.F., D.S.P., J.Y., C.K.H., K.M.K., N.H.K.), and Cardiothoracic Surgery (V.P., M.M.M.), University of California San Diego School of Medicine, 9300 Campus Point Dr, La Jolla, CA 92037-0841; and Department of Radiology, Stanford School of Medicine, Palo Alto, Calif (J.S.).