Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to chest radiograph from earlier today , right - sided pigtail catheter has been removed . Small right apical pneumothorax unchanged . Right lower lobe opacity is also unchanged . Retrocardiac opacity and small left effusion also unchanged . Mediastinal widening is comparable .
    OUTPUT:
    
Small right apical pneumothorax unchanged .