Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been mild interval increase in size of right apical pneumothorax which measures approximate 2 .4 cm . A right pigtail catheter is in unchanged position . The left lung is clear . No new pleural effusion . Cardiomediastinal and hilar contours are normal . No mediastinal shift or diaphragmatic flattening to suggest tension physiology .
    OUTPUT:
    
Mild increase in size of moderate right apical pneumothorax .