Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate stable post-operative changes of the left hemithorax , consistent with recent left upper lobectomy . No pneumothorax is seen . There has been decrease in the amount of subcutaneous emphysema . The right lung is clear .
    OUTPUT:
    
Interval decrease in quantity of subcutaneous emphysema .