Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The lungs are hyperinflated with flattening of the diaphragms . Mild enlargement of cardiac silhouette persists . There are calcifications of the aortic arch . There is no pulmonary vascular congestion . Linear opacities within the lung bases most likely reflect atelectasis . Blunting of the costophrenic angles posteriorly likely reflects the presence of trace bilateral pleural effusions . No pneumothorax is identified . There are no acute osseous abnormalities . Multilevel mild degenerative changes are noted in the thoracic spine . Extensive degenerative changes are also noted within the glenohumeral joints bilaterally , partially imaged .
    OUTPUT:
    
Mild bibasilar atelectasis and trace bilateral pleural effusions .