Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Lung volumes are low . The right heart border is obscured , but the heart is likely normal size . Mediastinal contours are normal . Right lower and middle lobe opacity with indistinctness of the right hemidiaphragm and blunting of the costophrenic angle likely represents a combination of effusion and consolidation . Left lung is clear . No pneumothorax .
    OUTPUT:
    
Small right pleural effusion with right base opacity , either atelectasis or infection .