Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right upper lobe volume loss is responsible for marked elevation of the right hilus . This could well be scarring , but should be evaluated by comparison to prior chest radiographs to see if there is any need to investigate possible bronchial obstruction . Lungs are otherwise clear . Cardiomediastinal and left hilar silhouettes are normal . There is no pleural effusion .
    OUTPUT:
    
Left upper lobe scarring and / or atelectasis , chronicity indeterminate .