From the case:
Annotated nasogastric tube placement
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Annotated study of http://radiopaedia.org/cases/normal-nasogastric-tube-position contributed by Dr Ian Bickle.
Illustrations made with Microsoft Paint.
Case Discussion
The tube descends in the midline, bisects the carina, passes the diaphragm in the midline and the tip resides below the diaphragm.