Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy and coronary artery bypass graft surgery . The cardiac , mediastinal and hilar contours appear unchanged . Similar mild relative elevation of the right hemidiaphragm is present . Streaky right basilar opacity suggests minor atelectasis or scarring . Elsewhere , the lungs remain clear . There is no pleural effusion or pneumothorax . Small anterior osteophytes are present along the lower thoracic spine .
    OUTPUT:
    
No evidence of acute disease .