Why does bile duct obstruction occur after cholecystectomy?

The most common cause of bile duct obstruction after cholecystectomy is calculus in bile duct, which may not be found by preoperative examination. After cholecystectomy, bile duct dynamics changes and bile duct obstruction occur. Another possibility is that the tumor in the biliary tract leads to bile duct obstruction. Another possibility is that it is caused by inflammatory stenosis of duodenal papilla. Finally, there is another possibility, but the incidence is very low, that is, bile duct stenosis caused by bile duct injury during operation. Now I just briefly introduce the common causes of bile duct obstruction. You'd better introduce the treatment process in detail, mainly including the following contents: 1. Why do you want to remove the gallbladder? 2. What are the symptoms before cholecystectomy and what tests have you done? It is best to provide the results of biliary tract examination and liver function examination; 3. How to find biliary obstruction after operation, what symptoms have appeared, what tests have been done, and how to describe the inspection report; 4. What operation was performed at the same time of cholecystectomy, and what was the situation during the operation?