A barium swallow is a diagnostic procedure for the esophagus and the stomach where a patient swallows barium sulphate, which blocks x-rays, and then is subjected to flouroscopy. The material coats the esophagus, allowing it to be seen as a hollow tube. It is usually used with sodium bicarbonate, which creates gas when swallowed, which doesn't block x-rays at all and shows as white areas.
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