Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacity at the right lung base has improved since prior exam . There is a new left lower lobe opacity in the retrocardiac area which is concerning for pneumonia or aspiration . There are small bilateral pleural effusions . Cardiomediastinal silhouette appears unchanged in size .
    OUTPUT:
    
New left lower lobe opacity concerning for pneumonia or aspiration pneumonia . Improving right basal opacity . Bilateral pleural effusions . These findings were communicated via the radiology critical results dashboard at 12 :57 p .m .