Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right pleural effusion may have changed in distribution , but is no bigger . Persistent air filled pleural space at the apex of the largely re-expanded postoperative right lung is unchanged . Cardiomediastinal silhouette is normal aside from a aortic calcification . Normal left lung . No left pleural effusion or pneumothorax .
    OUTPUT:
    
Right pleural effusion may have changed in distribution , but is no bigger .