Incidental Left-Sided Gallbladder During Laparoscopic Cholecystectomy: Tips & Tricks

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Laparoscopic Cholecystectomy When a Left-Sided Gallbladder Is Found Incidentally: Tips & Tricks

SEO Title: Incidental Left-Sided Gallbladder During Laparoscopic Cholecystectomy: Tips & Tricks
Meta Description: Left-sided gallbladder may be missed on ultrasound and discovered during laparoscopy. Learn the anatomical challenges, port modifications, traction techniques, Critical View of Safety and bailout strategies for safe laparoscopic cholecystectomy.
Keywords: left-sided gallbladder, laparoscopic cholecystectomy, incidental left-sided gallbladder, sinistroposition gallbladder, Critical View of Safety, bile duct injury, difficult cholecystectomy

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Introduction

Laparoscopic cholecystectomy is one of the most frequently performed laparoscopic procedures. However, the operation can become unexpectedly challenging when the gallbladder is found on the left side of the falciform/round ligament after laparoscopic entry.

A left-sided gallbladder (LSGB) is a rare anatomical variation. Importantly, it may not be recognized on preoperative ultrasonography and is often diagnosed only after establishing pneumoperitoneum and inspecting the abdominal cavity.

A systematic review of 112 patients with left-sided gallbladder found that only 29.6% were identified preoperatively on imaging, while ultrasound specifically detected the anomaly in only 2.7%. In that review, common bile duct injury occurred in 4.4% of patients undergoing cholecystectomy. (PubMed) 

Therefore, an unexpectedly left-sided gallbladder should immediately trigger a change from a “routine cholecystectomy” mindset to an anatomy-first, safety-first approach.

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What Is a Left-Sided Gallbladder?

A left-sided gallbladder is generally defined as a gallbladder positioned to the left of the ligamentum teres/round ligament.

It may occur:

• Without situs inversus
• With situs inversus
• With abnormal position of the falciform or round ligament
• With associated biliary ductal anomalies
• With vascular anatomical variations

Two broad anatomical situations have been described: a gallbladder truly attached to the left hepatic lobe and a gallbladder positioned left of the round ligament but still related to the right hepatic lobe.

Why is it important?

The gallbladder being on the left does not mean that the cystic duct will follow a predictable left-sided course.

The cystic duct may:

• Join the CHD from the left
• Cross toward the right
• Pass anterior or posterior to the CHD
• Join the biliary tree in an unusual configuration
• Be short or difficult to distinguish from the common hepatic duct

In the systematic review, five cystic duct–CHD configurations were identified. The most frequent configuration was a cystic duct that crossed anteriorly in a hairpin fashion and joined the right side of the CHD, accounting for 67.8% of cases. (PubMed) 

Therefore: never predict the cystic duct anatomy from the position of the gallbladder alone.

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When Ultrasound Has Not Diagnosed the Left-Sided Gallbladder

This is an important practical scenario.

The preoperative ultrasound may correctly identify:

• Gallstones
• Gallbladder wall thickening
• Gallbladder distension
• Pericholecystic fluid

but fail to recognize that the gallbladder is on the left.

This is not necessarily an imaging error. The systematic review found that ultrasound detected the left-sided position in only 3 of 112 patients (2.7%). (PubMed) 

Another published case specifically describes a patient whose ultrasound showed gallstones but did not identify the left-sided position; the anomaly was discovered during laparoscopy. (PubMed)

The key lesson

Do not rely exclusively on the preoperative ultrasound for biliary anatomy.

If the gallbladder appears unexpectedly left-sided at laparoscopy:

Stop routine dissection. Reorient yourself. Identify the anatomy before proceeding.

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What Should You Do When You Suddenly See a Left-Sided Gallbladder?

Step 1 — Stop and reassess the anatomy

The first response should not be to immediately start dissecting Calot’s triangle.

Identify:

• Falciform ligament
• Round ligament
• Gallbladder fundus
• Gallbladder body
• Infundibulum
• Liver segments III and IV
• Porta hepatis
• Expected location of CHD/CBD
• Relationship of the gallbladder to the liver

Take a few moments to understand the three-dimensional orientation.

This simple pause can prevent a major bile duct injury.

The SAGES Safe Cholecystectomy recommendations specifically support a momentary pause before clipping or dividing ductal structures to confirm that the Critical View of Safety has actually been achieved. (SAGES) 

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Step 2 — Optimize Exposure

Exposure is often the first technical problem.

The falciform ligament may interfere with:

• Fundal traction
• Instrument movement
• Visualization of the gallbladder neck
• The working angle between the surgeon and the gallbladder

Falciform ligament

If the falciform ligament restricts exposure, careful division of the falciform ligament can provide better fundal traction and working space.

The case report supplied with this article specifically notes that division of the falciform ligament may be necessary for unhampered fundal traction.

This is one of the most useful modifications when an LSGB is discovered unexpectedly.

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Step 3 — Do Not Be Dogmatic About Standard Port Position

The standard four-port arrangement may not provide the ideal geometry.

The surgeon may need to:

• Shift the epigastric/subxiphoid port toward the left
• Modify the lateral working port
• Change the camera angle
• Use the existing ports initially and reposition/add a port if required

Published reports describe transposition of the subxiphoid port and alteration of grasper traction as important modifications for safe laparoscopic cholecystectomy in LSGB. (PubMed)

The systematic review similarly identified different port-site placement and techniques involving the falciform ligament as common modifications. (PubMed) 

Practical principle

Port placement should serve the anatomy—not the other way around.

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Step 4 — Change the Direction of Traction

This is one of the most important technical differences.

With a normally positioned gallbladder, lateral and inferior traction on the infundibulum generally opens the hepatocystic triangle.

With a left-sided gallbladder, the optimal direction may be different.

Depending on the ductal anatomy, downward and leftward traction on the gallbladder neck/infundibulum may provide a better view of the hepatocystic triangle.

The case report provided describes this exact principle: when the cystic duct joins the CHD from the left, traction on the infundibulum/neck should be directed down and left to open the triangle.

Important caution

Traction should expose anatomy—not distort it.

Excessive traction can create a false impression of the cystic duct–CBD relationship.

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Step 5 — Identify the Cystic Artery Carefully

Do not assume the cystic artery follows the usual course.

In LSGB, vascular anomalies can accompany biliary anomalies.

Before clipping the artery:

• Identify its origin
• Follow it toward the gallbladder
• Confirm that it is actually entering the gallbladder
• Look for an accessory or replaced hepatic artery
• Avoid blind clipping of an unidentified vessel

The broader principle of safe cholecystectomy is that aberrant biliary and vascular anatomy must always be anticipated. (SAGES)

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Step 6 — Critical View of Safety Is Non-Negotiable

The discovery of a left-sided gallbladder is not an indication to abandon the Critical View of Safety.

The three components remain:

1. Clear the hepatocystic triangle

Remove fat and fibrous tissue sufficiently to understand the anatomy.

2. Separate the lower one-third of the gallbladder from the liver

This exposes the cystic plate.

3. See only two structures entering the gallbladder

These should be:

• Cystic duct
• Cystic artery

SAGES recommends the Critical View of Safety for identification of the cystic duct and artery during laparoscopic cholecystectomy. (SAGES) 

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The “Doublet View” Is Particularly Useful

Before clipping, obtain both:

Anterior view + posterior view

and confirm:

Two—and only two—structures enter the gallbladder.

SAGES describes this as a useful confirmation of the Critical View of Safety. (SAGES)

For an unexpectedly left-sided gallbladder, this additional confirmation is especially valuable because the duct may cross the expected operative field.

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Step 7 — Never Assume the Cystic Duct Is Where You Expect It

This is perhaps the single most important message of incidental LSGB.

The cystic duct may take a hairpin course and cross the CHD before joining it on the opposite side.

The systematic review found five different cystic duct configurations, with the right-sided CHD junction after an anterior hairpin course being the most frequent. (PubMed) 

The uploaded 2024 case report provides another important example: despite the gallbladder being left-sided, the cystic duct was found to enter the CHD from the right side.

Therefore:

Left-sided gallbladder ≠ left-sided cystic duct.

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Step 8 — Use Intraoperative Cholangiography When Anatomy Is Unclear

If there is any doubt regarding:

• Cystic duct identity
• CHD/CBD relationship
• A short cystic duct
• A crossing duct
• Possible aberrant hepatic duct
• Bile duct injury
• Unexpected biliary anatomy

then intraoperative biliary imaging should be strongly considered.

The multi-society SAGES guideline gives a strong recommendation for intraoperative biliary imaging when there is uncertainty about anatomy or suspicion of biliary injury. (SAGES) 

Depending on institutional expertise, this may include:

• Intraoperative cholangiography
• Laparoscopic ultrasound
• Near-infrared fluorescence cholangiography with ICG

However, fluorescence should be considered an adjunct, not a substitute for sound anatomical dissection and the Critical View of Safety.

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Step 9 — Consider MRCP if the Situation Allows

If the anomaly is discovered unexpectedly during an elective operation and there is substantial uncertainty about biliary anatomy, the surgeon should consider whether it is safer to:

• Obtain additional imaging
• Postpone the operation
• Seek HPB/senior surgical assistance

Cross-sectional imaging and MRCP can be useful for defining biliary anatomy when an anatomical anomaly is suspected.

The uploaded case demonstrates the importance of preoperative MRCP in complex anomalous anatomy, identifying the left-sided gallbladder along with choledochal cyst and pancreatic divisum.

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What If the Critical View Cannot Be Achieved?

This is where surgical judgment becomes more important than completing a conventional cholecystectomy.

Do not:

• Continue blind dissection
• Repeatedly pull on the infundibulum
• Clip a structure simply because it “looks like” the cystic duct
• Assume the structure nearest the gallbladder is the cystic duct
• Persist with Calot’s triangle dissection despite loss of anatomical planes

Instead:

STOP → REASSESS → IMAGE → MODIFY → BAIL OUT IF NECESSARY

SAGES recommends considering subtotal cholecystectomy when the Critical View cannot be achieved and biliary anatomy cannot be adequately defined by other methods. (SAGES)

Subtotal cholecystectomy can avoid dangerous dissection in the hepatocystic triangle.

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Conversion to Open Surgery Is Not a Failure

Conversion may be appropriate when:

• Anatomy remains unclear
• Severe inflammation prevents safe dissection
• Significant bleeding obscures the field
• Biliary anatomy cannot be defined laparoscopically
• The surgeon’s experience or available resources are insufficient

However, conversion itself does not automatically solve an anatomical identification problem.

The fundamental objective remains:

Identify the anatomy safely and avoid bile duct injury.

The SAGES guideline notes that evidence is insufficient to recommend conversion to open surgery over continued laparoscopic management solely as a strategy to prevent bile duct injury. (SAGES)

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A Practical Algorithm for Incidental Left-Sided Gallbladder

Unexpected left-sided gallbladder

↓

STOP routine dissection

↓

Identify falciform/round ligament and gallbladder orientation

↓

Improve exposure

• Divide falciform ligament if necessary
• Modify port position
• Optimize camera angle

↓

Identify gallbladder neck and expected biliary anatomy

↓

Alter traction direction

• Usually downward/leftward as dictated by anatomy

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Careful hepatocystic triangle dissection

↓

Identify cystic artery and cystic duct independently

↓

Achieve Critical View of Safety

↓

Momentary pause

↓

If anatomy is unequivocal → clip and divide

If anatomy is uncertain → IOC/other biliary imaging

↓

If CVS remains impossible → subtotal cholecystectomy / appropriate bailout

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Common Mistakes to Avoid

Mistake 1: “The gallbladder is left-sided, so the cystic duct must be on the left.”

Wrong.

The cystic duct may cross to the right and join the CHD there. (PubMed) 

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Mistake 2: Continuing with the standard port configuration

If the surgeon is struggling with instrument angles, change the ports rather than fighting the anatomy.

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Mistake 3: Excessive infundibular traction

Traction can distort the biliary anatomy and produce a false “infundibular view.”

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Mistake 4: Clipping after identifying only one tubular structure

The Critical View requires identification of two and only two structures entering the gallbladder. (SAGES)

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Mistake 5: Ignoring the falciform ligament

The falciform ligament may interfere substantially with exposure and traction in LSGB. Division can improve the working angle.

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Mistake 6: Persisting when the anatomy is unclear

An unclear anatomy is itself a warning sign.

The SAGES Safe Cholecystectomy Program recommends recognizing when dissection is approaching a zone of significant risk and changing to a safer strategy rather than continuing hazardous dissection. (SAGES)

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Why This Anomaly Matters

The largest systematic review available identified LSGB in only about 29.6% of patients on preoperative imaging, and ultrasound detected the anomaly in only 2.7%. Most were therefore discovered during surgery. (PubMed) 

This means every laparoscopic surgeon should be prepared for the possibility of an unexpected gallbladder position—even when the ultrasound report describes an apparently routine gallbladder.

The problem is not simply that the gallbladder is on the left.

The real concern is:

The biliary and vascular anatomy may also be different.

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Key Tips & Tricks — At a Glance

When you see an incidental left-sided gallbladder:

STOP — Don’t clip anything.

REORIENT — Identify the falciform and round ligament.

EXPOSE — Divide falciform ligament if it limits traction.

MODIFY PORTS — Optimize the working angle.

CHANGE TRACTION — Pull the neck according to the actual anatomy, often downward and leftward.

DISSECT CLOSE TO THE GALLBLADDER.

IDENTIFY THE CYSTIC DUCT AND ARTERY SEPARATELY.

ACHIEVE THE CRITICAL VIEW OF SAFETY.

PAUSE BEFORE CLIPPING.

USE IOC/INTRAOPERATIVE IMAGING IF ANATOMY IS UNCERTAIN.

BAIL OUT EARLY IF SAFE CVS CANNOT BE ACHIEVED.

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Take-Home Message

An incidentally discovered left-sided gallbladder during laparoscopic cholecystectomy is a warning to slow down—not a reason to panic.

The operation can usually be completed laparoscopically, but the surgeon must abandon the assumption that the biliary anatomy will be conventional.

The safest strategy is:

Recognize → Reorient → Improve exposure → Modify ports and traction → Identify anatomy → Achieve Critical View of Safety → Image when uncertain → Bail out when necessary.

The key lesson from both the published literature and the supplied case is simple:

Never determine the cystic duct anatomy from the position of the gallbladder. Determine it by direct anatomical identification.

This approach is consistent with the multi-society Safe Cholecystectomy recommendations, which emphasize Critical View of Safety, intraoperative imaging when anatomy is uncertain, and bailout procedures when safe identification cannot be achieved. (SAGES) 

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Key Facts

What is a left-sided gallbladder?
A gallbladder located to the left of the ligamentum teres/round ligament.

Can ultrasound miss a left-sided gallbladder?
Yes. In a systematic review, ultrasound identified LSGB in only 2.7% of reported cases. (PubMed) 

What is the most important operative concern?
Aberrant cystic duct and biliary anatomy with increased risk of bile duct injury.

Should standard port placement always be used?
No. Ports may need modification to optimize exposure and traction. (PubMed) 

Should the falciform ligament be divided?
If it restricts exposure or fundal traction, careful division can improve the operative field.

Can the cystic duct still join the CHD from the right?
Yes. This is actually the most frequently reported configuration in the systematic review. (PubMed) 

When should intraoperative cholangiography be considered?
When biliary anatomy is uncertain or bile duct injury is suspected. (SAGES) 

What if Critical View of Safety cannot be achieved?
Do not persist with hazardous dissection. Consider biliary imaging and an appropriate bailout, including subtotal cholecystectomy. (SAGES) 

Bottom line:

Left-sided gallbladder is an anatomical surprise; bile duct injury is the complication we must prevent.

Educational content for surgeons and healthcare professionals. Operative decisions should be individualized according to the patient’s anatomy, pathology, surgeon expertise, available imaging and institutional resources.