Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is no effusion or pneumothorax . Small retrocardiac patchy density overlies the spine . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Small patchy density in the left lower lobe could represent pneumonia .