Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette is moderately enlarged . Fullness of the azygos is not accompanied by any other signs of right heart failure . No new focal opacities . Left lower lobe appears relatively clear on today 's examination .
    OUTPUT:
    
No comparison exam for the recent left lower lobe pneumonia ; however , no definitive opacity in left lower lobe today .