Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright AP radiograph of the chest demonstrates interval placement of a pigtail pleural catheter in the left hemithorax , with associated reexpansion of the left lung . A small basilar pneumothorax remains , improved since the prior study . No other significant change is noted compared to the prior study from two hours ago .
    OUTPUT:
    
Left pleural pigtail catheter placement with reexpansion of the left lung . A small left basilar pneumothorax remains .