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Related Experiment Video

Updated: Feb 3, 2026

Laparoscopic Common Bile Duct Exploration Followed by Primary Suture Using a Modified Bile Duct Incision
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Laparoscopic Common Bile Duct Exploration Followed by Primary Suture Using a Modified Bile Duct Incision

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Common bile duct dilation after bariatric surgery.

Neal Mehta1, Andrew T Strong2, Tyler Stevens3

  • 1Department of Internal Medicine, Medicine Institute, Cleveland Clinic Foundation, Cleveland, OH, USA.

Surgical Endoscopy
|October 25, 2018
PubMed
Summary
This summary is machine-generated.

Bariatric surgery, including Roux-en-Y gastric bypass (RYGB) and sleeve gastrectomy (SG), causes common bile duct (CBD) dilation. This dilation is more significant after RYGB than SG and occurs regardless of cholecystectomy status.

Keywords:
Bariatric surgeryCommon bile duct dilationInterventional endoscopyRoux-en-Y gastric bypassSleeve gastrectomy

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Area of Science:

  • Gastroenterology
  • Bariatric Surgery
  • Hepatobiliary System

Background:

  • Biliary dilation often indicates obstruction, but post-bariatric surgery patients present with radiographic dilation and normal endoscopic findings.
  • The cause of this biliary dilation and its relation to specific bariatric procedures remain unclear.

Purpose of the Study:

  • To investigate changes in common bile duct (CBD) diameter following Roux-en-Y gastric bypass (RYGB) and sleeve gastrectomy (SG).

Main Methods:

  • A retrospective study analyzed radiographic imaging of 269 adult patients before and after RYGB or SG (2010-2013).
  • Common bile duct (CBD) diameter was re-measured by a radiologist, excluding patients with known obstructions.
  • Clinical factors and cholecystectomy status were recorded.

Main Results:

  • RYGB was associated with a greater increase in CBD diameter (1.4 mm) compared to SG (0.5 mm).
  • Biliary dilation after RYGB was independent of prior cholecystectomy.
  • Sleeve gastrectomy (SG) also led to a significant CBD diameter increase (0.8 mm) in patients without a prior cholecystectomy.

Conclusions:

  • Bariatric surgery, particularly RYGB, leads to common bile duct (CBD) dilation.
  • The observed biliary dilation is a post-surgical phenomenon, occurring irrespective of cholecystectomy.
  • Further research is needed to understand the etiology and clinical significance of this post-bariatric surgery biliary dilation.