Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from earlier the same day at 2 :38 p .m . There has been interval placement of a left - sided chest tube projecting over the left lower hemithorax . There is overlying subcutaneous gas . Lucency still persists adjacent to the mediastinum on the left . Otherwise , there has been no change . Multiple right - sided rib fractures are better seen on the prior exam .
    OUTPUT:
    
Interval placement of a left - sided chest tube projecting over the left hemithorax .