Which radiographic sign is associated with the narrowing of the bowel lumen due to fibrosis and spasm in Crohn disease?
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Correct answer: String sign
The 'string sign' is a radiological finding observed during a barium swallow/enema, representing a severely narrowed segment of bowel. It is caused by edema, inflammation, or fibrosis in Crohn disease, often at the terminal ileum.
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