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 . There is an apparent retrocardiac opacity on the lateral projection which obscures the posterior heart border raising potential concern for an early pneumonia in the right or left lower lobe though not clearly visualized on the frontal view . No large effusion or pneumothorax . No convincing signs of edema . The cardiomediastinal silhouette appears within normal limits . Bony structures are intact .
    OUTPUT:
    
Subtle retrocardiac opacity on the lateral projection only raising concern for an early pneumonia in the right or left lower lobe . Please correlate clinically .