Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A nasogastric tube courses through the esophagus , and although it is very difficult to clearly visualize , it appears to terminate below the level of the diaphragm . The distal side hole port can not be identified . The visualized lungs are clear . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
NG tube courses below the level of the diaphragm , although distal side hole port is not visualized . Advancement of ___ centimeters would ensure appropriate positioning .