Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest compared to previous exam from earlier same day at 6 :32 p .m . There has been interval placement of a left - sided chest tube seen projecting over left lung base , side port within the thoracic cavity . Overlying subcutaneous gas is identified . Pneumothorax seen at the lower chest on prior has resolved . There is still subtle lucency adjacent to the AP window suggesting persistent pneumothorax , although no discrete pleural line is identified . Right lung remains clear . Cardiomediastinal silhouette is stable as are the osseous structures .
    OUTPUT:
    
Interval placement of left - sided chest tube with decrease in size of pneumothorax which may persist medially .