Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Bibasilar atelectasis / scarring is again noted , unchanged from prior . Cardiomediastinal silhouette is unremarkable . There is no pneumothorax or pleural effusion . Old left rib fracture is seen .
    OUTPUT:
    
No acute cardiopulmonary process .