Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large right pleural effusion which has increased significantly since the prior film . This has resulted in adjacent compressive atelectasis . The left lung is clear . There are no consolidations or pneumothoraces seen . The mediastinum is unremarkable . The assessment of heart size is limited given large right pleural effusion . The trachea is midline .
    OUTPUT:
    
Large right pleural effusion .