Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right pleural effusion with overlying atelectasis appears increased as compared to the prior study right base opacity may be due to pleural effusion and atelectasis underlying consolidation is not excluded . The cardiac silhouette remains enlarged . Patient is status post median sternotomy and cardiac valve replacement . There is concern for a small right apical pneumothorax , present on prior studies , but slightly more conspicuous than on the most recent prior .
    OUTPUT:
    
Small right apical pneumothorax , present on prior but more conspicuous as compared to the most recent prior study . right base opacity may be due to combination of pleural effusion and atelectasis underlying consolidation is not excluded . Persistent enlargement of the cardiac silhouette .