Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . The patient is status post sternotomy . Surgical clips are present in the upper anterior mediastinum . The aorta is tortuous and the heart mildly enlarged . Streaky left mid lung opacity suggests minor scarring . Otherwise , the lungs appear clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
No evidence of acute disease .