Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and coronary artery stenting . Heart size is normal . Mediastinal and hilar contours are unchanged with atherosclerotic calcifications noted involving the aortic knob . Pulmonary vasculature is normal . Hilar contours are unremarkable . Lungs are clear . No pleural effusion or pneumothorax is seen . Moderate degenerative changes are noted in the thoracic spine
    OUTPUT:
    
No acute cardiopulmonary abnormality .