Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . A small right pneumothorax is slightly improved since ___ . Multiple right rib fractures are again noted . The heart size remains normal . The hilar and mediastinal contours are within normal limits . There is mild elevation of the right hemidiaphragm . No effusions are present .
    OUTPUT:
    
Slight decrease in size of a small right pneumothorax .