Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Significant decrease in the bibasilar opacities , with mild residual left lower lobe opacity . Moderate pulmonary edema has also improved in is now mild . Probable small left effusion decreased since the prior . Mild cardiomegaly . No pneumothorax . Prior median sternotomy and CABG .
    OUTPUT:
    
Overall improvement of pulmonary edema . Bibasilar opacities have improved with persistent asymmetric left lower lobe opacity may reflect pneumonia or residual atelectasis .