Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right pigtail drain has been placed in the interim with the tip projecting over the lateral mid right hemithorax with apparent resolution of the pneumothorax on this single upright AP view . Residual pneumothorax , if present , is tiny . Right lateral seventh and eighth rib fractures are minimally are nondisplaced . Lung volumes are slightly low . Lungs are clear except for minor atelectasis at both bases . The heart is top - normal in size . The mediastinum is not widened .
    OUTPUT:
    
No evidence of substantial pneumothorax after interval placement of right pigtail drain .