They often manifest as a concentric thickening of the bile duct, coupled with infiltration of the periductal tissues. By contrast, nodular lesions project directly into the lumen of the bile duct.

Background: The purpose of the present study was to define the differential diagnostic markers of benign and malignant bile duct strictures without demonstrable mass on ultrasonography (US ...

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The liver surface could also have contouring or striations. Certain conditions may affect the bile ducts. If the bile can't flow freely through the ducts, it may build up in the liver, causing damage.