Chapter 29, Ep 3 of 7: The Obstructed and Indeterminate Biliary Tree

Episode three centers on the stricture you cannot name: painless jaundice, a tight narrowing, and imaging that says cancer without proving it. Tissue acquisition is the whole game, and every step up the diagnostic cascade works by getting closer to the tumor, from a shallow brush that misses submucosal cholangiocarcinoma to intraductal biopsy and FISH to cholangioscopy to an EUS needle in the mass itself. The transplant candidate inverts that hierarchy, because a needle in the hilar primary can seed the peritoneum and disqualify the cure. Then durable drainage follows anatomy: covered metal distally to block ingrowth, uncovered metal at the hilum to preserve side branches, and always enough viable liver drained to clear the bilirubin.   Topics covered Brush cytology and why it misses cholangiocarcinoma Intraductal biopsy, FISH, and cholangioscopy EUS fine needle biopsy of a pancreatic head mass Transplant candidate and needle-tract seeding Endoscopic ampullectomy versus Whipple Distal covered metal stents Hilar uncovered metal stents and side branches Draining fifty percent of viable liver     Key decisions Do not trust a negative brush cytology in a malignant-looking stricture; stack intraductal forceps biopsy and FISH for polysomy, then cholangioscopy with targeted biopsy, because each step samples deeper than superficial shed cells. For a pancreatic head mass needing tissue before neoadjuvant chemotherapy, use EUS-guided fine needle biopsy of the mass itself, favoring a biopsy needle over aspiration when you need core architecture and immunohistochemistry. In a transplant candidate never needle the hilar primary by EUS or percutaneous route; stay inside the duct with brush and intraductal biopsy, and biopsy suspicious regional nodes only as a transplant-eligibility test. Resect an ampullary adenoma en bloc for lesions up to two to three centimeters after EUS excludes intraductal extension, accepting a ten to fifteen percent pancreatitis rate to spare the patient a Whipple. Place a prophylactic five French pancreatic duct stent after ampullectomy, skip the submucosal lift, and survey the resection bed at three and six months with a side-viewing duodenoscope in FAP. Use a fully covered self-expanding metal stent for distal malignant obstruction to block tumor ingrowth and allow removal at the Whipple, reserving plastic stents for a life expectancy under three months. At the hilum use an uncovered metal stent so side-branch bile flows through the mesh, map viable territories with MRCP, and drain at least fifty percent of viable liver while avoiding atrophic segments.     This is an AI-generated podcast, and some pronunciations may be imperfect. Thank you for your understanding, and we hope you enjoyed this content.   For the full chapter with MCQs, tables, and primary-guideline references, visit www.boardpearls.com.   Questions or feedback: [email protected].