Barium sulfate is an inert substance when confined to the gastrointestinal lumen. However, if it extravasates into the peritoneal cavity or mediastinum due to a bowel perforation, it can cause severe inflammatory reactions (barium peritonitis or mediastinitis), which are highly morbid and potentially fatal. Therefore, suspected bowel perforation is an absolute contraindication for barium sulfate. In such cases, water-soluble iodinated contrast agents are preferred as they are less irritating if they leak. Suspected esophageal varices (Option A) and severe dysphagia (Option D) are relative contraindications or require careful administration, but not absolute contraindications. Allergic reactions to barium (Option B) are exceedingly rare as barium sulfate is not absorbed.
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