Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Enteric tube is seen terminating in the stomach . Pacer line terminates in the expected location of the right ventricle . There are low lung volumes and bibasilar atelectasis . Mild prominence of the pulmonary vasculature may be due to low lung volumes , although mild pulmonary vascular congestion may be present . There is no pneumothorax . There is no evidence of free air beneath the diaphragms . The cardiac silhouette is stable .
    OUTPUT:
    
Low lung volumes and bibasilar atelectasis . No evidence of free air beneath the diaphragms .