Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP , upright and lateral views of the chest provided demonstrate vague opacity at the left lung base concerning for an early pneumonia . The lung appears clear . No large effusion is seen . There is no pneumothorax . Cardiomediastinal silhouette is stable . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Vague opacity at the left lung base concerning for an early pneumonia .