Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hyperexpansion is consistent with COPD , unchanged from prior studies . Bibasilar atelectasis is noted . There is no pulmonary edema , pneumothorax , or pleural effusion . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
1 . No evidence of acute cardiopulmonary process . 2 . COPD .