Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Status post median sternotomy . There is mild cardiomegaly . There are bibasilar lower lobe opacities , new since prior , may represent atelectasis or developing infectious process . There is mild central vascular engorgement which may reflect mild pulmonary edema .
    OUTPUT:
    
1 . Mild pulmonary edema . 2 . Bibasilar slightly more dense opacities , may represent either atelectasis or developing infectious process .