Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hyperinflated with flattening of the diaphragms most likely reflective of COPD . The cardiac , mediastinal and hilar contours are unchanged and within normal limits . Linear opacities within the left lung base likely reflect areas of scarring and / or subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . The pulmonary vasculature is not engorged . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality . COPD .