Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The heart size is normal . The aortic knob is calcified . The mediastinal and hilar contours are unremarkable . The pulmonary vascularity is not engorged . The lungs are hyperinflated with flattening of the diaphragms suggestive of underlying COPD . Lungs are otherwise clear . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process . COPD .