Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Left lower lobe retrocardiac opacity may represent pneumonia . There is no effusion or pneumothorax . The cardiomediastinal silhouette is normal . Bilateral shoulder hardware is seen without complication . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Left lower lobe retrocardiac opacity may represent pneumonia , althoug it is faint and other causes of fever are possible .