How does stricture morphology help to differentiate between benign and malignant disease

How does stricture morphology help to differentiate between benign and malignant disease?

Benign biliary strictures tend to taper smoothly, with gradual narrowing across their length. Malignant biliary strictures, in contrast, are points of obstruction that end abruptly, sometimes with irregular borders or an appearance of “shouldering.”

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