Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided chest tube is visualized within the left lower chest . There is also a left - sided PICC line with the tip position unchanged from the previous study . An opacity projecting over the left lower chest persists and is not significantly changed . Right lung appears to be clear . No pneumothorax is identified .
    OUTPUT:
    
No acute changes compared to the prior study .