Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . The heart size remains mildly enlarged . Mediastinal and hilar contours are similar with tortuosity of the thoracic aorta again noted . Coronary artery stent is also re - demonstrated . Pulmonary vasculature is not engorged . Lung volumes are low with minimal bibasilar atelectasis , but no focal consolidation . No pleural effusion or pneumothorax is identified . There are mild multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .