Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are unchanged . Patient has known emphysema . Small right effusion has minimally decreased . Right lower lobe atelectasis has decreased . There is no evident pneumothorax . There are moderate degenerative changes in the thoracic spine . There are no new lung abnormalities .
    OUTPUT:
    
Small right effusion . No pneumothorax . Emphysema .