Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were provided . Lung volumes are low which limits evaluation . Since the prior exam , the right effusion has resolved . There is mild bibasilar atelectasis . No overt evidence of CHF or pneumonia . Vague retrocardiac opacity is noted in the left lower lobe which is more likely atelectasis than pneumonia . Cardiomediastinal silhouette is normal . Bony structures are intact .
    OUTPUT:
    
No overt signs of pneumonia or CHF . Mild bibasilar atelectasis .