Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a subtle linear opacity in the left lower lung field , without a correlate on the lateral view . This most likely represents atelectasis rather than a focal consolidation . The lungs are otherwise clear . There are no findings to suggest varicella pneumonia . There is no pneumothorax or pleural effusion . The hilar and cardiomediastinal contours are normal . Pulmonary vascularity is normal .
    OUTPUT:
    
1 . No findings typical of varicella pneumonia . 2 . Subtle left lower lung field opacity , seen only on the PA view , which most likely represents atelectasis rather than a focal consolidation .