Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Heart size is top normal . Cardiomediastinal and hilar contours are unremarkable . A small right - sided pleural effusion is redemonstrated . There is no pneumothorax . No subdiaphragmatic free air is identified .
    OUTPUT:
    
Unchanged small right - sided pleural effusion . No evidence of pneumonia .