Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are again seen to be hyperinflated , with evidence of chronic obstructive pulmonary disease . Left mid lung linear scarring is again seen . There is slight increase in interstitial markings bilaterally in the perihilar regions which may relate to differences in technique versus minimal edema . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Slight interval increase in interstitial markings bilaterally in the perihilar regions , may relate to differences in technique versus minimal edema . COPD . No focal consolidation .