Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . The heart is mildly enlarged with a left ventricular configuration , as before . The aortic arch is partly calcified with mild unfolding along the upper descending thoracic aorta , again without significant change . The lungs are clear . There is no pleural effusion or pneumothorax . Mild degenerative changes involving the mid - to - lower thoracic spine are similar .
    OUTPUT:
    
Status post coronary artery bypass graft surgery . No evidence of acute disease .