Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size is mildly enlarged . The mediastinal and hilar contours are unchanged . Lungs remain hyperinflated with apical predominant emphysema re - demonstrated . While linear opacities in the upper lobes are compatible with scarring , there is increased hazy opacification in both upper lobes . No pulmonary edema is present . Small to moderate size left pleural effusion is noted with bibasilar atelectasis . No pneumothorax is present . No acute osseous abnormality is visualized .
    OUTPUT:
    
1 . Small to moderate - sized left pleural effusion with bibasilar atelectasis . 2 . Increased hazy opacities in the upper lobes may reflect superimposed infection or aspiration on a background of scarring and emphysema .