2 causes: Stones that are found in the bile duct within 2 years after removing the gallbladder are considered to have originated in the gallbladder and passed into the bile duct but not found during the operation. A stone in the duct that is found > 2 yrs post op is considered a primary bile duct stone. The treatment is the same, though--usually ERCP, sometimes with stent placement.
Answered 5/10/2018
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