Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left - sided subclavian catheter , endotracheal tube , and enteric tube remain appropriately positioned . There has been interval development of a retrocardiac opacity at the left lung base , which is most compatible with subsegmental atelectasis . There is also new left lung base linear atelectasis . The cardiomediastinal silhouette is stable . No bony or soft tissue abnormality is identified .
    OUTPUT:
    
New left lung base subsegmental atelectasis . New right lung base linear atelectasis . Lines and tubes in satisfactory position