Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is moderate hyperexpansion suggesting underlying COPD . Bibasilar airspace opacities most likely represent atelectasis given the rapid progression compared with the recent prior study . There is no pulmonary vascular congestion or pneumothorax . Widening of the upper mediastinum is unchanged from recent prior chest radiographs and chest CT is again recommended .
    OUTPUT:
    
1 . Bibasilar airspace opacities most likely represent atelectasis . 2 . Hyperexpansion consistent with COPD . 3 . Upper mediastinal widening for which contrast - enhanced chest CT is again recommended .