Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lung volumes are low limiting assessment . Subtle retrocardiac opacity may be compatible with atelectasis versus an early left lower lobe pneumonia . Please correlate clinically . No large effusion or pneumothorax . Cardiomediastinal silhouette appears normal . No free air below the right hemidiaphragm . Bony structures are intact .
    OUTPUT:
    
Low lung volumes with retrocardiac opacity concerning for an early pneumonia . Please correlate clinically .