Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are normal . The lungs are clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax . There is no pleural effusion . Pulmonary vascularity is normal . The patient is status post median sternotomy and CABG . There are degenerative changes of the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process . Normal lung volumes .