Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The moderate left - sided pneumothorax has not changed in appearance since the prior radiograph of approximately ___ min earlier . The left - sided chest to appears to have been retracted slightly . Slightly increased opacification in the region of the right lung base . Cardiomediastinal silhouette is unchanged in position . No change in the endotracheal tube , NG tube , or right IJ central line .
    OUTPUT:
    
Persistent moderate left - sided pneumothorax has not changed since the radiograph from ___ min earlier .