Key Takeaways
- Clinical Bottom Line
- The Evolution of Biliary Rescue
Clinical Bottom Line
| Drainage Approach | Anatomical Route | Standard Indication |
|---|---|---|
| Standard ERCP | Transpapillary (through the Ampulla of Vater). | First-line standard of care for biliary obstruction. |
| EUS-CDS (Choledochoduodenostomy) | Creating a direct fistula from the duodenal bulb instantly into the bile duct. | Malignant obstruction where the papilla is inaccessible due to a tumor (Failed ERCP). |
| EUS-HGS (Hepaticogastrostomy) | Creating a fistula from the stomach into the left hepatic duct. | Severe malignant gastric outlet obstruction blocking duodenal access. |
The Evolution of Biliary Rescue
Historically, if a standard ERCP failed to cannulate the bile duct (usually owing to a massive pancreatic adenocarcinoma physically destroying the duodenal ampulla), the patient was immediately subjected to a painful, highly morbid percutaneous transhepatic cholangiography (PTC) drain, which pierced through their external skin and liver. In 2026, EUS-guided biliary drainage has completely replaced external PTC drains for massive malignant obstructions.
Lumen-Apposing Metal Stents (LAMS)
Using a linear echoendoscope, the physician visualizes the massively dilated bile duct exactly 1 centimeter away, residing just behind the duodenal wall. Utilizing electrocautery, the endoscopist punches a Lumen-Apposing Metal Stent (LAMS) straight through the bowel wall directly into the bile duct. This rapidly decompresses the infected bile directly back into the intestine internally, bypassing the obstructing cancer entirely without requiring external tubes or surgical bypass.
Clinical guidelines summarized by the Gastroscholar Research Team. Last updated: 2026. This article is intended for physicians.
