Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left pigtail chest tube is in place . No recurrence of left apical pneumothorax . Small left pleural effusion is unchanged . The remaining pleural surfaces are normal . The lungs are clear . The cardiomediastinal and hilar contours are normal .
    OUTPUT:
    
No recurrence of left apical pneumothorax . Persistent small left pleural effusion .