Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and show mild bilateral lower lobe atelectasis . The cardiac silhouette is enlarged . The mediastinal silhouette and hilar contours are normal . No pleural effusion or pneumothorax is present . No pulmonary edema .
    OUTPUT:
    
Mild bibasilar atelectasis but no evidence for congestive heart failure or pneumonia .