Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated , likely due to chronic changes of COPD . There is no focal airspace opacity , pulmonary edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
1 . No acute cardiopulmonary process ; specifically , no evidence of pneumonia . 2 . Stable chronic changes of COPD .