Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Lung volumes are somewhat low . Subtle opacity in the left lower lung may represent an early pneumonia in the correct clinical setting . Elsewhere lungs are clear . No large effusion or pneumothorax . Cardiomediastinal silhouette appears normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Subtle opacity in the left lower lung is concerning for an early pneumonia in the correct clinical setting .