Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy , CABG , mitral and tricuspid valve replacements . Heart size is normal . Mediastinal and hilar contours are unremarkable . Lungs are clear . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is present . Moderate degenerative changes with osteophyte formation are present in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .