Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . No confluent opacity is identified . There is no pneumothorax . Small pleural effusion is possible , would require lateral view for assessment . Cardiomediastinal and hilar contours are within normal limits . There is no subdiaphragmatic free air .
    OUTPUT:
    
No free pneumoperitoneum .