Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The mediastinal and hilar contours are within normal limits . There is no pulmonary vascular congestion . Linear opacities within the left lung base and right mid lung are unchanged , and likely reflect areas of scarring . The lungs are hyperinflated with flattening of the diaphragms compatible with COPD . There are no acute osseous abnormalities .
    OUTPUT:
    
No radiographic evidence for pneumonia or pulmonary edema . COPD .