Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded with flattened diaphragms consistent with history of COPD . Mediastinal contours , hila , and cardiac silhouette are normal . No pleural effusion or pneumothorax .
    OUTPUT:
    
1 . No pneumonia or pulmonary edema . 2 . Chronic obstructive pulmonary disease .