Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube is seen with tip 4 .5 cm from the carina . There is near complete opacification of the left hemithorax with some aerated left upper lung . Cardiac silhouette is deviated to the left suggesting component of left - sided volume loss . Right lung is clear . Cardiac silhouette can not be adequately assessed for size .
    OUTPUT:
    
ET tube appropriately positioned . Significant opacity in the left hemithorax with leftward mediastinal shift suggesting at least some component of atelectasis . Additional etiologies such as effusion or infection would be possible .