Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Following removal of right pigtail catheter , the right apical pneumothorax is slightly bigger compared to prior ; however , it is still small . The fluid component of the hydropneumothorax is unchanged . Lung parenchymal changes are stable . The heart and mediastinum are unchanged .
    OUTPUT:
    
Slight increase in right pneumothorax following removal of pigtail catheter . No change in fluid component . The remainder of the chest is unchanged .