Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Comparison is made to the next preceding similar examination obtained two and a half hours earlier . The previously described left - sided apical pneumothorax appears completely unchanged in size . No new pulmonary parenchymal abnormalities beyond those described earlier . No significant mediastinal shift has occurred . Right hemithorax is unremarkable as before .
    OUTPUT:
    
Stable chest findings , no significant difference in previously described left - sided apical pneumothorax . Referring physician , ___ was paged at 4 :35 p .m . and it was communicated that the findings are stable .