Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy and coronary artery bypass graft surgery . A dialysis catheter terminates in the upper atrium and appears unchanged in position . The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . The lungs appear clear .
    OUTPUT:
    
Stable positioning of dialysis catheter . No evidence of acute cardiopulmonary disease .