Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is marked hyperlucency of the right lung , which may be due to a combination of bullous emphysema as well as a pneumothorax . There is also seen around the aortic arch on the left . There is slight leftward shift of the mediastinum . Severe background emphysema is present . The heart is not enlarged . No large pleural effusion is seen .
    OUTPUT:
    
Hyperlucent right lung , likely due to a combination of bullae and emphysema , confirmed on subsequent CT chest .