Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Again seen is shift of the mediastinum to the left and slightly hyperexpanded right lung , consistent with post-surgical changes . Clips are seen in the left lower lobe . There is elevation of the left hemidiaphragm with probably small left pleural effusion . Lungs are grossly clear . There is no focal consolidation . No pneumothorax . Mediastinal and hilar contours are stable .
    OUTPUT:
    
Minimal improvement in aeration of the left lung compared to ___ . Postoperative changes with probable small left pleural effusion .