Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiographs . There is a large bullae in the left lower lobe that has enlarged from prior and causes adjacent atelectasis . Subsegmental atelectasis also involves the right lower lobe . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .