Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . The lungs appear clear . There is moderate right - sided pneumothorax . The maximum distance between the inner chest wall and outer pleural edge is about 3 .5 cm . The pneumothorax appears probably unchanged . There is very slight leftward shift of mediastinal structures although perhaps slightly decreased .
    OUTPUT:
    
Moderate right - sided pneumothorax including minimal leftward shift . The size of the pneumothorax appears not significantly changed and the degree of shift slightly decreased .