Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mild atherosclerotic calcifications are noted at the aortic knob . The mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Lungs are hyperinflated with emphysematous changes noted . Lungs are otherwise clear without focal consolidation . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Emphysema .