Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a linear band of increased opacity in the left mid lung . Otherwise , the lungs are well expanded and clear . The heart size is normal . The mediastinal and hilar contours are normal . There is no subdiaphragmatic free air .
    OUTPUT:
    
1 . Left mid lung linear scar versus atelectasis . 2 . No pneumonia .