Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is unchanged with severe cardiomegaly . In comparison to ___ study there is improvement of right lung base opacification with increased opacification of the left lower lung which may represent left lower lung atelectasis with a superimposed pneumonia .
    OUTPUT:
    
Improved right lung base opacification and increased opacification of left lower lung which may represent left lower lung atelectasis with a superimposed pneumonia . .