Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated , suggesting chronic obstructive pulmonary disease . Streaky right middle lobe opacity may be due to pneumonia versus atelectasis . There is mild left base atelectasis . No focal consolidation or pleural effusion is seen . The heart is normal in size . Mediastinal contours are unremarkable .
    OUTPUT:
    
Right middle lobe opacity could be due to pneumonia or atelectasis .