Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left costrophrenic angle is blunted on PA chest radiograph , but does not persist on lateral view . There is no focal consolidation or pneumothorax . Bibasilar atelectasis is resolved . The cardiomediastinal silhouette is within normal limits . Prior right rib fractures are partially visualized .
    OUTPUT:
    
Left costrphrenic atelectasis or scarring . No acute cardiopulmonary process .