Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Apparent widening of the mediastinum is likely related to rotated position of the patient and expiratory phase . Heart size is top normal . Increased opacification at the right base likely reflects a combination of atelectasis and effusion , new . The left lung is clear . No pneumothorax .
    OUTPUT:
    
New right lower lobe opacification is likely related to atelectasis / effusion in the postoperative setting .