Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . The heart size is normal . The aorta is mildly tortuous . Mediastinal and hilar contours are otherwise within normal limits . Lungs are clear . No pleural effusion or pneumothorax is identified . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .