Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiograph from ___ , there has been some increase of a small right apical pneumothorax . A right pleural pigtail catheter remains in unchanged position . Left lung is clear . There are no new focal consolidations . The cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Interval increase of a small right apical pneumothorax .