Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post CABG . Severe cardiomegaly is again noted , with mild central pulmonary vascular congestion and interstitial edema . Bibasilar opacities likely reflect atelectasis , although superimposed infection is not excluded . No evidence of pneumothorax or large pleural effusion .
    OUTPUT:
    
1 . Severe cardiomegaly and mild pulmonary vascular congestion . 2 . Bibasilar opacities likely reflect atelectasis , although superimposed infection is difficult to exclude .