Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from earlier the same day . There has been interval placement of a right - sided chest pigtail catheter projecting with tip over the right upper lung medially . There has been interval reduction in size of the right - sided pneumothorax with some lucency projecting medially at the lung base suggestive for some residual pneumothorax . There is persistent lower lobe atelectasis . There has been resolution of shift of the mediastinal structures to the left . Left lung remains clear , noting chronic changes at the base . Cardiomediastinal silhouette is stable .
    OUTPUT:
    
Interval placement of right pigtail catheter with decrease in size of pneumothorax and mediastinal shift .