Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left basilar pigtail catheter remains in place with a residual small left pleural effusion . Lung volumes are low , but the right lung remains clear . There is new left mid lung subsegmental atelectasis . There is no pneumothorax . The cardiomediastinal silhouette is magnified by the projection .
    OUTPUT:
    
New left mid lung subsegmental atelectasis . Otherwise no significant interval change .