Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to ___ , poorly defined opacities in the lower lobes bilaterally have slightly improved . There are associated small bilateral effusions . The cardiac silhouette is unremarkable . No pneumothorax .
    OUTPUT:
    
Interval improvement in the ill - defined bilateral lower lobe airspace opacities , possibly representing improving aspiration and or infectious pneumonia .