Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Minimal interval decrease in size of the opacity in the superior segment of the left lower lobe . Unchanged left pleural effusion . The right lung is clear . The size and appearance of the cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
Minimal decrease in size of the opacity in the superior segment of the left lower lobe . Unchanged moderate left pleural effusion .