Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size remains borderline enlarged , and unchanged . The aorta is tortuous . Lungs remain hyperinflated with attenuation of the pulmonary vascular markings towards the apices compatible with underlying emphysema . There is no pulmonary vascular congestion . Patchy bibasilar airspace opacities could reflect atelectasis . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild bibasilar atelectasis . Emphysema .