Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The heart is mildly enlarged , and the aorta demonstrates mild tortuosity . The pulmonary vascularity is not engorged . Blunting of the right costophrenic sulcus likely reflects a small right pleural effusion . Minimal linear opacities in the lung bases likely reflect atelectasis . There is no focal consolidation or pneumothorax . Hyperinflation of the lungs possibly reflects underlying COPD .
    OUTPUT:
    
Trace right pleural effusion and mild bibasilar atelectasis .