Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy with intact appearing wires . Multiple mediastinal surgical clips are compatible with prior CABG surgery . The cardiac silhouette is enlarged but stable . The mediastinal contours are prominent related in part to unfolding of the thoracic aorta . Dense calcification of the aortic knob is re - demonstrated . The lung volumes are decreased from the most recent prior study . Small bilateral pleural effusions are present . Bibasilar opacification may represent atelectasis in the setting of low lung volumes but superimposed infection is not excluded in the appropriate clinical context . There is interval development of mild pulmonary vascular congestion and interstitial pulmonary edema .
    OUTPUT:
    
1 . Mild pulmonary vascular congestion and pulmonary edema with small bilateral pleural effusions , new from ___ , is most compatible with an acute CHF exacerbation . 2 . Bibasilar opacification most likely represents atelectasis in the setting of low lung volumes ; superimposed infection at the left lung base is doubted , but hard to exclude .