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[L. strictura, contraction]
A narrowing or constriction of the lumen of a tube, duct, or hollow organ such as the esophagus, ureter, or urethra. Strictures may be congenital or acquired. Acquired strictures may result from infection, trauma, fibrosis due to mechanical or chemical irritation, muscular spasm, or pressure from adjacent structures or tumors. They may be temporary or permanent, depending on the cause.

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