Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Ats come to radiograph from the day prior , left - sided pigtail catheter in similar position . Small apical left pneumothorax is unchanged . Left moderate pleural effusion is stable . Small right pleural effusion is also stable . Bibasal opacities have improved .
    OUTPUT:
    
Stable left apical pneumothorax .