Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA AND LATERAL VIEWS OF THE CHEST . Linear densities in the left lower lobe either represent linear atelectasis or bronchiectasis . No evidence of pneumonia . Otherwise the lungs are clear . There are no pleural effusions or pneumothorax . The cardiac , mediastinal , and hilar contours are normal .
    OUTPUT:
    
Linear densities in the left lower lobe may either represent linear atelectasis or bronchiectasis . No evidence of pneumonia .