Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Lung volumes are low which accentuates the size of the cardiac silhouette . The heart size does appear at least mild to moderately enlarged . The aorta is tortuous . Mediastinal and hilar contours are otherwise unchanged . Crowding of the bronchovascular structures is demonstrated with probable mild pulmonary vascular congestion but no overt pulmonary edema . Minimal blunting of the right costophrenic sulcus suggests a trace right pleural effusion . No pneumothorax is present . Streaky opacities are seen within the lung bases , likely atelectasis . Mild to moderate multilevel degenerative changes are noted in the thoracic spine . Remote bilateral rib fractures are noted .
    OUTPUT:
    
Low lung volumes with possible mild pulmonary vascular congestion and trace right pleural effusion . Bibasilar atelectasis .