Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a moderate - to large - sized right pleural effusion which is unchanged from prior . A small left pleural effusion is likely unchanged as well . Atelectasis is seen at the left lung base and in the right middle lobe . Heart size is difficult to interpret . The mediastinal silhouette is unremarkable . There is no pneumothorax .
    OUTPUT:
    
Unchanged moderate - to - large right pleural effusion and small left pleural effusion .