Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval placement of pigtail catheter chest over the right lower hemi thorax with subsequent significant interval decrease in right pleural effusion . Right base atelectasis is seen . The left lung remains clear . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Interval significant decrease in right pleural effusion status post placement of pigtail catheter .