Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post midline sternotomy and CABG . The cardiomediastinal contour is within normal limits . A Swan - Ganz catheter terminates in the right main pulmonary artery and could be pulled back 2 - 3 cm to be in the main pulmonary artery . There has been interval removal of an endotracheal tube and esophageal tube . Lung volumes are low . The right lung is clear . There is minimal atelectasis at the left base . Lucency along the right heart border likely represents small pneumopericardium . There is evidence of gastric overinflation .
    OUTPUT:
    
1 . Swan - Ganz catheter terminates in the right main pulmonary artery and could be pulled back 2 - 3 cm to be in the main pulmonary artery . 2 . Lucency along the right heart border likely represents small pneumopericardium .