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 . Subtle opacity at the left lung base is concerning for pneumonia . Right lung is clear . No large effusion or pneumothorax . Heart size is incompletely assessed . The aorta is unfolded . Bony structures are intact .
    OUTPUT:
    
Subtle left basal opacity is concerning for an early pneumonia .