Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the radiograph from earlier on the same date , the left pigtail catheter has been removed and a left chest tube is now in place . There is a persistent large amount of left pleural fluid , with an irregular contour of the left chest wall , possibly suggesting loculation . Small right effusion unchanged . The other monitoring and support devices are unchanged in the interval .
    OUTPUT:
    
Interval placement of a left - sided chest tube with removal of prior pigtail catheter , with a large persistent amount of left pleural fluid , which may be loculated .