Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior exam , a new pigtail catheter has been placed . It overlies the right upper lung zone . The right pneumothorax has decreased in size and is now small , measuring approximately 8 mm in width . There is no evidence of tension physiology . There is no left pneumothorax . The lungs are clear without consolidation or edema . There is no pleural effusion . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Interval placement of a right pigtail catheter , which overlies the right upper lung zone . A small right apical pneumothorax persists , though is smaller is size since the prior exam .