The common bile duct: drains bile from the liver and gallbladder into the duodenum. The upper limit of normal for your age would be 5-6mm diameter. The duct can dilate if it is obstructed by a stone, mass, or stricture. The duct can also be passively dilated following gallbladder removal or other biliary surgery/procedures, in which case it is not due to obstruction but is the "new normal" for you. Talk to your doc.
Answered 11/15/2014
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