Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Severe emphysema including chronic bullous change of the right upper lung is unchanged from the prior study . There is persistent bibasilar atelectasis , particular within the medial lung bases . There is no focal consolidation , pulmonary edema , or pneumothorax . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
Unchanged severe bullous emphysema with persistent medial bibasilar atelectasis . No focal consolidation .