Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy . The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . Patchy opacity in the lingula appears unchanged and is likely due to scarring or atelectasis rather than an acute process . There has been no significant change .
    OUTPUT:
    
Stable appearance of the chest .