Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study and allowing for technical differences , I doubt significant interval change . Minimal patchy opacity at the left base may be slightly worse . Clips are again noted over the upper left lung and left hilar region . Again seen is relative lucency at the left lung apex , though no well demarcated pneumothorax is identified . Given that this is an upright film , this is therefore less likely to represent a pneumothorax . Again seen is right - sided chest tube . No right - sided pneumothorax is identified . Background opacities in both lungs are similar to the are otherwise similar to the prior film .
    OUTPUT:
    
Possible slight worsening of opacity at the left lung base . Otherwise , I doubt significant interval change . No pneumothorax identified .