Part 2 · Dyes, Tracers and Treating with Rays
Same concept, other depth: Clinical Reasoning →
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A 50‑year‑old man has had difficulty swallowing for two months. He drinks a cup of chalky white liquid while the radiologist watches on a fluoroscopy screen. The white barium flows smoothly down, then suddenly narrows into an irregular, shouldered stricture. A narrowing like this suggests oesophageal cancer and needs endoscopy and biopsy. Without the barium, his oesophagus would have been invisible.
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