Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no effusion or pneumothorax . Pulmonary vascular congestion is very mild . There is prominent streaky subsegmental atelectasis at the right base . In addition , there may be superimposed consolidation . There is persistent enlargement of the right hilum as well as slight enlargement of the left hilum . The cardiomediastinal silhouette is otherwise normal . Retrocardiac opacities , likely atelectasis is mild .
    OUTPUT:
    
1 . Opacity in the right middle lobe may be due to a combination of atelectasis and pneumonia . 2 . Bilateral hilar enlargement , right greater than left .