Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright AP and lateral views of the chest are provided . A pattern of chronic fibrosis is unchanged and likely reflects underlying emphysema . There is mild bibasilar atelectasis . No definite signs of edema or pneumonia . The heart and mediastinal contour appear stable . The imaged osseous structures are intact .
    OUTPUT:
    
No acute findings .