Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild hyper inflation and lucency in the upper lung fields compatible with known emphysema . There are no focal opacities to suggest pneumonia . The cardiomediastinal silhouette and hilar contours are stable . There is no cardiomegaly . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Emphysema . No acute cardiopulmonary abnormality and no evidence of pneumonia .