Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is moderately enlarged . The mediastinal silhouette and hilar contours are unchanged . A moderate to large right - sided pleural effusion is slightly increased in volume compared to prior examination with collapse of much of the right lower lobe and right middle lobe . There is also some consolidation at the base of the right upper lobe which could be due to compressive atelectasis . There is no left effusion . The upper lung zones appear clear . There is no pneumothorax .
    OUTPUT:
    
Slightly increased moderate to large right - sided pleural effusion with collapse of much of the right middle lobe and right lower lobe . Superimposed pneumonia can not be excluded given the appropriate clinical circumstance .