Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior study , the heart has enlarged . Patchy opacities at the bilateral lung bases may be due to atelectasis or scarring , as it is unchanged since ___ . No evidence of overt pulmonary edema . No focal consolidation concerning for pneumonia is identified . No pleural effusions or pneumothorax .
    OUTPUT:
    
Patchy opacities at the bilateral lung bases likely due to atelectasis or scarring , unchanged since ___ . No evidence of overt pulmonary edema .