Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Heart size is mildly enlarged . Aorta is mildly tortuous and diffusely calcified . Hilar contours are unremarkable . Pulmonary vasculature is not engorged . Lungs are clear . No focal consolidation , pleural effusion or pneumothorax is identified . No subdiaphragmatic free air is present . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No subdiaphragmatic free air .