Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . Median sternotomy wires are intact and well aligned . There is evidence of prior CABG . The cardiac silhouette is stably enlarged . The mediastinal and hilar contours are not significantly changed since prior examinations . Similar to prior examinations , there is an area of scarring and small pleural effusion obscuring the right lung base , which is unchanged since prior examinations . No definite consolidation is noted . There is no pneumothorax .
    OUTPUT:
    
Stable right lower lung scarring and effusion .