Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study there is a new right middle lobe opacity and small right pleural effusion . There is increased volume loss in the right lower lobe . The known right infrahilar mass was better appreciated on the recent chest CT . Severe emphysema with apical bullous is again visualized . Stable heart size .
    OUTPUT:
    
1 . New right middle lobe opacity could reflect atelectasis or infection . 2 . New small right pleural effusion . 3 . Unchanged appearance of right infrahilar mass consistent patient 's known lung cancer .