CALOTCholecystectomy Anatomy, Learning & Operative Technique Exam zone
The operation

Laparoscopic bile duct exploration

Clearing the duct at the same operation is safe and spares the patient an ERCP. The route you choose decides the leak rate.

Latest source: Aroori et al. (R-ALiCE), Surg Endosc 2026 · about 5 min read · how evidence is marked

Reviewed against its sources on 22 October 2026.

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Three things to remember
  1. One-stage exploration and two-stage ERCP are equally safe in trials; local expertise decides.
  2. Go transcystic first; open the duct only for the big stone, the many stones or the stone above the junction.
  3. Close primarily when duct clearance, distal flow and tissue quality permit; reserve a T-tube or stent for selected concerns.

01One stage or two

Know this
  • A duct stone can be cleared before the operation (ERCP, then cholecystectomy), during it (laparoscopic bile duct exploration, LCBDE) or after it (ERCP). Randomised trials show no clear winner on safety.
  • One-stage surgery saves an admission and an ERCP, and it leaves fewer retained stones than surgery followed by ERCP.
  • The real deciders are local: a surgeon who does it regularly, the kit on the shelf, the size of the cystic duct and the size of the stone.
0.7% vs 1%
mortality, LCBDE versus ERCP before surgery: no difference (Cochrane, 5 trials, 580 patients)
8% vs 11%
retained stones, LCBDE versus ERCP before surgery: no difference
9% vs 25%
retained stones, LCBDE versus ERCP after surgery: fewer with exploration (2 trials, 166 patients)

ERCP keeps its place: cholangitis that needs drainage now, an impacted ampullary stone, a patient too unwell for a long operation, and any unit without the expertise to explore the duct. See when to image the duct.

Sources

Dasari et al., Cochrane 2013: 16 trials, 1,758 participants, all at high risk of bias. Systematic review

02Transcystic or through the duct

Transcystic

Through the cystic duct, with a basket under X-ray or a thin choledochoscope. No cut in the common duct, so almost no leaks and no stricture risk. Needs a cystic duct that will open up and stones small enough to come back through it.

R-ALiCE: tried in 71.5 percent, worked in 77.6 percent of those, bile leak 1.5 percent

Choledochotomy

A cut in the front wall of the common duct, then a choledochoscope, baskets and lithotripsy. Gets the big stone, the many stones and the stone above the junction. The price is a suture line in a bile duct: more leaks, and a stricture risk in a narrow duct.

R-ALiCE: worked in 93.4 percent, bile leak 8.8 percent

1,689
patients, 18 UK centres, 2015 to 2019 (R-ALiCE)
4.4%
retained stones overall, the same by either route
0.4%
30-day mortality; conversion 5 percent; median stay 3 days

Go transcystic first when you can. A meta-analysis of 21 studies (5,518 patients, mostly not randomised) found fewer bile leaks, fewer complications and a shorter stay with the transcystic route, with the same stone clearance. Observational Switch to the duct when the cystic duct will not take the scope, the stone is too big, or the stones sit above the junction. Expert opinion

Sources

UK multicentre audit: Aroori et al. (R-ALiCE), Surg Endosc 2026: transcystic versus transductal bile leak odds ratio 6.76 (95% CI 3.75 to 12.19). Meta-analysis: Zheng et al., Front Surg 2025: bile leak OR 0.37, complications OR 0.47, stay 2.9 days shorter with the transcystic route; heterogeneity high. Observational SAGES clinical spotlight review on laparoscopic bile duct exploration (see references).

03Closing the duct: no routine T-tube

Know this
  • After choledochotomy, use primary closure when clearance, distal flow and duct tissue allow. Do not insert a T-tube routinely.
  • Consider a T-tube, external biliary drain or stent selectively if there is concern about distal obstruction, retained stones or closure; choose according to the operative findings and expertise.
+ 3.3 days
longer stay with a T-tube (Cochrane, 3 trials, 295 patients)
+ 21 min
longer operation with a T-tube
11% vs 6%
serious complications, T-tube versus primary closure: not significantly different, no deaths
Do
  • Close with fine absorbable sutures once the scope shows a clear duct and a free ampulla.
  • Leave a drain to the subhepatic space so that a leak declares itself as a drain, not as peritonitis. Expert opinion
  • Consider closure over a transcystic drain or an antegrade stent when you are unsure of the ampulla. Expert opinion
Don’t
  • Put in a T-tube by habit.
  • Open a narrow duct. A stricture in a small duct is a bigger problem than the stone. Expert opinion
  • Close a duct you have not cleared. Debris and an impacted stone need the scope, lithotripsy or a plan for ERCP.
Source

Gurusamy, Koti and Davidson, Cochrane 2013: operating time 21.2 minutes longer (95% CI 12.4 to 30.0), stay 3.26 days longer (95% CI 2.49 to 4.04), serious morbidity 11.3 versus 6.1 percent (RR 1.86, 95% CI 0.87 to 3.96). All three trials were at high risk of bias; absence of demonstrated routine benefit does not exclude selective indications. Systematic review The SAGES CBDE review describes selective T-tube, external drain or stent use for concerns about narrowing, papillary oedema, elevated duct pressure or retained stones.

04The exploration in brief

A common pattern of steps. Units differ in the details. Author practice

  1. Cholangiogram first. It shows the number, size and position of the stones and the anatomy you are about to enter. Flush and glucagon clear some small stones on their own.
  2. Transcystic attempt. Open the cystic duct near the gallbladder, dilate it gently, pass a basket under X-ray or a thin choledochoscope, and bring the stones back out. Do not force a stone through a duct that is too small for it.
  3. Choledochotomy if needed. A short lengthways cut on the front of the duct above the duodenum, no longer than the largest stone. Scope both ways, clear with baskets, use lithotripsy for an impacted stone.
  4. Prove it is clear. Completion choledochoscopy or cholangiogram, and a free flow of contrast into the duodenum.
  5. Close and drain. Primary closure. Close the cystic duct with a loop or suture after a transcystic exploration, not with a clip on a dilated stump.
  6. Write it down. Route, stones removed, how clearance was confirmed, how the duct was closed, and the plan if the drain is bilious.

05After the operation

  • A bilious drain after a choledochotomy is usually a suture-line leak. Most settle with drainage; a rising output or jaundice means ERCP with a stent. See the complications page.
  • Pancreatitis is uncommon after exploration (0.9 percent in R-ALiCE) and usually mild.
  • Retained stones are a plan, not a failure: ERCP after surgery clears them. Tell the patient on the day if you suspect one.
  • Enhanced recovery applies to these patients too: early feeding, early mobilisation and criteria-led discharge. See enhanced recovery for the inpatient.
Watch

Links checked 25 October 2026. The providers may ask you to sign in.

06What examiners ask

  1. A fit 50-year-old has a 7 mm stone in an 9 mm duct on MRCP. What are the options, and how do you choose?
  2. Transcystic or choledochotomy: when, and why does it matter?
  3. Would you put in a T-tube? Justify your answer with evidence.
  4. The drain is bilious on day 2 after a choledochotomy. What do you do?
Most recent sources on this page: Aroori et al. (R-ALiCE), Surg Endosc 2026; Zheng et al., Front Surg 2025.

Test yourself further: Practise questions on Bile duct exploration in the Exam zone.