Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a left - sided chest catheter with only minimal reexpansion of the left lung . The previously noted flattening of the left hemidiaphragm is no longer seen . Right lung remains clear . Cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Interval placement of left - sided chest catheter with only minimal to no significant change in large left - sided pneumothorax . Previously noted flattening of the left hemidiaphragm is no longer seen .