1. From the Department of Radiology, Section of Thoracic Imaging, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, WI 53792 (R.S., C.A.M., M.D.M.R., J.E.K., J.P.K.); and Division of Cardiothoracic Imaging, Department of Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Md, and Cardiothoracic Section, American Institute for Radiologic Pathology, Silver Spring, Md (A.A.F.).