IMPRESSION:
Status post median sternotomy for CABG with overall stable cardiac and
 mediastinal contours given differences in patient positioning.  Persistent low
 lung volumes with scattered patchy opacities within both lungs but
 predominantly the bases most likely reflecting patchy atelectasis.  Crowding
 of the pulmonary vasculature with no overt pulmonary edema.  No pleural
 effusions or pneumothoraces.