Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Large right pleural effusion with overlying atelectasis has significantly increased compared the prior study . No left pleural effusion is seen . Patchy left base opacity could be due to pneumonia , aspiration , or atelectasis . No pneumothorax is seen . Cardiac silhouette is top - normal . Mediastinal contours are unremarkable .
    OUTPUT:
    
Large right pleural effusion with overlying atelectasis , significantly increased compared to the prior study . Patchy left base , possibly lingular , opacity could be due to atelectasis , infection , or aspiration .