Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle opacity at the left lung base is new . Mild elevation of left hemidiaphragm is unchanged . No other focal airspace opacity . Heart size is normal . Cardiomediastinal hilar silhouettes are unremarkable . An enteric tube side port terminates in the gastric body .
    OUTPUT:
    
Subtle left basilar opacity may reflect focal aspiration or developing pneumonia .