Endoscopic Ultrasound Drainage Matches ERCP as First-Line Relief for Bile Duct Cancer Blockage

For patients whose pancreatic or bile duct cancer has blocked the lower bile duct and whose tumor cannot be removed surgically, relieving that blockage is one of the most important palliative procedures medicine can offer. A new randomized controlled trial from Mansoura University in Egypt reports that endoscopic ultrasound-guided choledochoduodenostomy, a technique that creates a direct connection between the bile duct and the duodenum through the bowel wall, performed just as well as the long-standing standard, endoscopic retrograde cholangiopancreatography, when used as the first-line drainage method. Technical success reached 100 percent in both arms of the study, clinical success rates were statistically indistinguishable, and neither procedure time nor adverse events favored one technique over the other.

After 164 eligible patients were screened, 64 were excluded, leaving 50 randomized to each arm using sealed envelopes with computer-generated sequences.

The technical details of the two procedures highlight why the comparison matters.

The headline numbers were remarkably even. Technical success, defined as stent insertion with confirmed flow of contrast or bile, was achieved in all 100 patients. Clinical success, defined as a drop in total serum bilirubin to less than half of baseline at two weeks, was 90.9 percent in the EUS-guided arm, 40 of 44 evaluable patients, versus 95.6 percent in the ERCP arm, 44 of 46 patients, a difference that carried no statistical significance with a P value of 0.429. Median procedure time was 13.29 minutes for the ultrasound-guided approach and 15 minutes for ERCP, again with no significant difference. Ten patients died within the first two weeks from disease progression or cardiopulmonary complications unrelated to the procedures, which explains why the clinical success denominators fall below 50 per arm.

The overall rate and severity grading showed no significant difference between arms, with a P value of 0.862. In the ultrasound-guided group, one patient developed biliary peritonitis managed conservatively in intensive care, two patients bled from contralateral duodenal wall injury caused by the edge of the metal stent and were treated endoscopically with argon plasma coagulation and a double pigtail plastic stent. In the ERCP group, one patient suffered moderate post-procedure pancreatitis requiring five days of intensive care, and one developed acute cholecystitis needing percutaneous gallbladder drainage. Across both groups, 31 patients experienced procedure-related events within 30 days, graded by the AGREE classification: twenty had intermittent abdominal pain requiring analgesics, five had fever requiring potent antibiotics, and the remaining serious events were the individual cases described above.

Stent performance over the following months was equally balanced. At follow-up visits at two weeks and one, three and six months, assessed with laboratory tests and abdominal ultrasound, there was no tumor ingrowth or stent blockage in either arm up to 180 days. The only dysfunction appeared in the ultrasound-guided arm, where two patients experienced stent migration at a mean of 177.8 days, but in neither case did the migration cause obstruction or require reintervention. This absence of tumor ingrowth in the surgical bypass-style drainage route reflects one of the technique’s theoretical advantages: because the stent does not cross the malignant stricture, tumor tissue cannot grow into it, although food impaction rates in this route have been reported to offset that benefit in other studies.

Survival, which depends primarily on the underlying cancer rather than the drainage method, was also comparable. Median overall survival was 124.3 days in the ultrasound-guided arm, with a 95 percent confidence interval of 105.1 to 143.5 days, versus 138.3 days in the ERCP arm, with a confidence interval of 121.0 to 155.6 days, a nonsignificant difference. At the six-month endpoint, 23 patients in the ultrasound-guided group had died compared with 19 in the ERCP group. Critically, no procedure-related mortality occurred in either arm; all deaths were attributed to disease progression or cardiopulmonary complications and judged unlikely to be related to the interventions.

The findings align with a growing but still limited literature. Earlier randomized trials cited in the paper reported technical success ranging from about 91 to 93 percent for ultrasound-guided drainage against 94 to 100 percent for ERCP, and clinical success rates between roughly 87 and 96 percent in both modalities, all without statistical significance. Meta-analyses have similarly found cumulative technical success of 94.8 percent versus 96.5 percent and adverse event rates of 16.3 percent versus 18.3 percent. Some individual trials, however, did find the ultrasound-guided route faster, with procedure times as short as 5 minutes versus 11, and one reported significantly longer stent patency of 208 days versus 165 days, differences the Mansoura team attributes partly to endoscopist experience and device selection.

The authors are candid about the study’s limits. All interventions took place at a single tertiary center, performed by one endoscopist, and expertise in this technique remains concentrated in a few high-volume academic hospitals because of its difficulty and complexity. Cost-effectiveness was not assessed, and the team calls for larger studies and meta-analyses. Still, for the roughly one in ten patients in whom standard ERCP cannulation fails, and for the broader population of patients with unresectable distal obstruction, the trial offers solid randomized evidence that creating a choledochoduodenal connection under endoscopic ultrasound guidance is a legitimate first-line option rather than merely a salvage maneuver, delivering equivalent drainage with equivalent safety when performed by experienced hands.

Subject of Research: A randomized trial comparing EUS-guided choledochoduodenostomy with ERCP drainage as primary biliary decompression in unresectable distal malignant biliary obstruction

Article Title: “Endoscopic ultrasound-guided choledochoduodenostomy versus endoscopic retrograde cholangiopancreatography for primary biliary decompression in distal malignant biliary obstruction: a randomized comparative study”

Article References: Gaheen, A., Attwa, M., Hakim, H., Deiab, A., & Altonbary, A. (2026). “Endoscopic ultrasound-guided choledochoduodenostomy versus endoscopic retrograde cholangiopancreatography for primary biliary decompression in distal malignant biliary obstruction: a randomized comparative study”. Egyptian Liver Journal, 16(1), Article 73. https://doi.org/10.1186/s43066-026-00539-y

Image Credits: AI Generated

DOI: 10.1186/s43066-026-00539-y

Keywords: EUS-guided biliary drainage, ERCP, choledochoduodenostomy, malignant biliary obstruction, randomized controlled trial, stent patency, pancreatitis, palliative drainage, self-expanding metal stent, interventional endoscopy, clinical success, adverse events