Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy . The heart is normal in size . Mediastinal and hilar contours are unremarkable . Lung volumes are low . Streaky opacities in the lingula are most consistent with minor scarring or atelectasis . Otherwise , the lungs appear clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .