Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a right - sided pigtail catheter with terminates over the right hemi thorax / right upper abdomen . A chest tube is again seen in unchanged position . The size of a a large multiloculated right pleural effusion is stable compared to the prior examination done earlier this morning . No pneumothorax is identified . Opacity at the right base is consistent with atelectasis and effusion , also similar in extent . The cardiomediastinal and hilar contours are stable . The left lung appears clear .
    OUTPUT:
    
Interval placement of a right - sided pigtail catheter without significant interval change in the size of a large multiloculated right pleural effusion . Right basal opacity is most consistent with some compressive adjacent atelectasis .