Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac size is top - normal . The aorta is tortuous . Patient is status post CABG . . The lungs are clear . There is no pneumothorax or pleural effusion . There are mild degenerative changes in the thoracic spine . Sternal wires are aligned . Lumbar hardware is partially imaged .
    OUTPUT:
    
No acute cardiopulmonary abnormalities