A series of x-ray pictures of the esophagus taken after a patient drinks a liquid containing barium sulfate (a form of the silver-white metallic element barium). The barium sulfate coats and outlines the inner wall of the esophagus so that it can be seen on the x-ray pictures. Also called esophagram.
( KON-trast ee-SAH-fuh-gram )
Source: NCI Dictionary of Cancer Terms
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