Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval placement of a right pleural pigtail catheter with no significant interval change in the moderate to large right pneumothorax . Unchanged small right pleural effusion , right hilar prominence and increased opacities at the right lung base . The left lung remains clear . No mediastinal shift . The appearance of the cardiac silhouette is unchanged .
    OUTPUT:
    
Interval placement of a right pigtail catheter without significant change in the appearance of the moderate to large right pneumothorax .