Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A nasogastric tube terminates in the stomach , but it only passes beyond the hemidiaphragm by about 6 cm and it may be appropriate to advance it further to secure optimal drainage . The cardiac , mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . The lungs appear clear . No free air is demonstrated .
    OUTPUT:
    
Nasogastric tube terminating in the stomach . Advancing the tube is recommended , however , to obtain optimal drainage .