Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Lung volumes are low . Bibasilar atelectasis . No definitive evidence of pneumonia . In the low lung volumes , however , evaluation is slightly limited . No large effusion or pneumothorax . The cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
No convincing signs of pneumonia on this slightly limited exam .