DefinitionA biliary tract biopsy is a procedure that involves taking a sample of tissue or material from the duodenum, bile ducts, pancreas, or pancreatic duct. The sample is then tested for cancer or other diseases.Alternative NamesCytology analysis - biliary tractHow the test is performedTissue or material samples can be obtained in several ways, depending on the problem.If there is a well-defined tumor, the sample can be taken through an aspiration needle. The puncture site will be numbed. Then the needle is inserted through the skin into the lining or tissue to be tested. A small amount of tissue is taken in through the needle, and the needle is removed. The puncture site is then covered to control any bleeding. Pressure may be applied to the puncture site if bleeding continues.If ther