Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Cardiac silhouette size is mildly enlarged , but improved compared to the previous study . The aorta is tortuous . The mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is normal . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . There are mild degenerative changes seen in the thoracic spine . Clips are noted in the right upper quadrant of the abdomen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .