Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacities in the right middle and lower lobes appear not significantly changed since prior studies . The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . The chest is perhaps hyperinflated to some degree .
    OUTPUT:
    
Persistent opacities in the right lower and middle lobes , but apparently chronic , suggesting atelectasis or chronic airway inflammation most likely .