Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size is normal . Mediastinal and hilar contours are unremarkable . Lungs are clear and the pulmonary vascularity is normal . There is no pleural effusion or pneumothorax . Mild degenerative changes are present within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .