Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior study there is no substantial change . The heart is normal size and cardiomediastinal contours stable . Lungs remain hyperinflated suggesting underlying emphysema . Post treatment changes in the left midlung are overall unchanged given differences in technique . There is no new consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
No evidence of pneumonia . Stable left post treatment changes . Emphysema .