Summarize biliary tract surgical procedures and other surgically relevant interventions such as endoscopic retrograde cholangiopancreatography (ERCP).

Surgical Procedures of the Biliary Tract

Primary Surgical Procedures

Laparoscopic Cholecystectomy

Laparoscopic cholecystectomy is the gold standard definitive treatment for symptomatic gallstone disease and should be performed in over 95% of cases. 1, 2

• Critical View of Safety technique must be achieved during dissection to prevent bile duct injury; conversion to open surgery is mandatory if this view cannot be obtained rather than persisting with difficult dissection. 3
• Early surgical intervention prevents complications—approximately 30% of patients managed conservatively develop recurrent gallstone-related complications over 14 years compared to only 3% who undergo surgery, and 60% ultimately require cholecystectomy anyway under less favorable circumstances. 2
• Intraoperative cholangiography (IOC) or laparoscopic ultrasound (LUS) should be performed in patients with intermediate-to-high pre-test probability of common bile duct stones (CBDS) who lack preoperative confirmation. 4, 1

Laparoscopic Common Bile Duct Exploration (LCBDE)

LCBDE provides single-stage definitive treatment for CBD stones with outcomes equivalent to ERCP but shorter hospital stays. 1

Indications for LCBDE:

• Confirmed or highly suspected CBD stones detected preoperatively, intraoperatively, or postoperatively 1
• Intraoperative detection of stones by cholangiography or laparoscopic ultrasound 1
• Failure of ERCP with sphincterotomy and standard extraction techniques 1
• Difficult stone disease (large, impacted, or multiple stones not amenable to standard endoscopic removal) 1

Surgical Techniques:

Transcystic Approach:

• Preferred when feasible; suitable only for small stones (<6–8 mm) 1
• Provides limited access to common hepatic duct but shortens operative time and accelerates recovery 1

Transductal (Choledochotomy) Approach:

• Required for larger stones or when transcystic access is inadequate 1
• Allows direct visualization and manipulation of the entire duct 1
• Closure options include primary closure (associated with ~8-day faster return to work), T-tube drainage, or antegrade stent placement 1

Required Equipment:

• Ultra-thin (≈3 mm) choledochoscope with light source and camera 4, 1
• Disposable instruments: baskets, balloons, stents (similar to ERCP) 4, 1
• Blind instrumentation of the bile duct must never be performed—choledochoscopic visualization is mandatory to avoid perforation and subsequent stricture formation. 4, 1

Success Rates:

• Near-100% stone clearance is achievable when intraductal lithotripsy (piezoelectric or laser) is available 1
• When standard extraction fails, cholangioscopy-guided electrohydraulic or laser lithotripsy yields stone clearance rates of 73–97% 4, 1
• Prophylactic antibiotics are mandatory because cholangitis can occur in up to 9% of cases 4, 1

Comparison with ERCP:

• No difference in efficacy, mortality, or morbidity between LCBDE and perioperative ERCP 1
• LCBDE provides shorter hospital stay 1
• LCBDE eliminates the need for two separate procedures (ERCP plus cholecystectomy) 1

Current Limitations:

• Fewer than one-third of units routinely employ LCBDE 1
• Steep learning curve—only 20% of bile duct explorations currently performed laparoscopically 1
• Requires specialized equipment that may not be available in all settings 1

Open Bile Duct Exploration

• Reserved for the small subset of patients in whom laparoscopic and endoscopic methods are unsuccessful or impossible 1
• Should always be undertaken with a choledochoscope unless no alternative is available, as blind manipulation carries risk of perforation and traumatization with increased risk of later stricture development 4

---

Surgically Relevant Endoscopic Interventions

Endoscopic Retrograde Cholangiopancreatography (ERCP)

ERCP has evolved from a primarily diagnostic to therapeutic procedure and is the gold standard minimally invasive modality for treatment of biliary pathologies. 5, 6

Primary Indications:

• Choledocholithiasis with or without cholangitis 6
• Pancreatic duct stones 6
• Benign and malignant strictures 6
• Bile and pancreatic leaks 6
• Patients with surgically altered anatomy where laparoscopic access is difficult 7

Diagnostic Role:

• The diagnostic role of ERCP has been largely replaced by high-quality imaging modalities including endoscopic ultrasound (EUS) and magnetic resonance cholangiopancreatography (MRCP) 5
• Among patients undergoing first-time ERCP, the preceding clinical diagnosis was correct for 64% of those predicted to have bile duct stones and 86–89% of those given other biliary diagnoses 8
• Diagnostic confidence improved substantially after ERCP in 35% of cases 8

Therapeutic Success:

• Technical success rate is high (>90%) 9
• Endoscopic therapy was successfully completed in 51% of cases 8
• At least three-quarters of ERCP procedures are currently therapeutic 9

Clinical Utility:

• Most helpful for diagnosis of bile duct stones 8
• Endoscopic therapy commonly changes treatment plans, leading to fewer surgical and percutaneous interventions in general, but more laparoscopic cholecystectomies 8
• Plans for other invasive procedures changed in 82% of cases after ERCP 8
• Particularly helpful in patients with cholangitis, jaundice, or bile leaks 8

Mortality and Complications:

• Postprocedure 30-day mortality rate ranged between 1–5% 9
• Mortality strongly correlated with older age, male sex, emergency admission, and noncancer comorbidities 9
• Patients with primary sclerosing cholangitis or liver cirrhosis require particular attention 9

Preoperative Requirements:

• Full blood count and INR/PT must be obtained before any biliary sphincterotomy 1
• Anticoagulated patients should be managed according to British Society of Gastroenterology (BSG) / European Society of Gastrointestinal Endoscopy (ESGE) endoscopy guidelines 1

Endoscopic Papillary Balloon Dilation (EPBD)

• EPBD with prior sphincterotomy facilitates removal of large stones and is supported by high-quality evidence 1
• EPBD without sphincterotomy may be used in patients with uncorrectable coagulopathy or altered anatomy, employing a maximum 8 mm balloon 1

Cholangioscopy-Guided Lithotripsy

In patients in whom clearance of CBDS has been unsuccessful despite standard techniques, cholangioscopy-guided intraductal lithotripsy using electrohydraulic lithotripsy (EHL) or laser lithotripsy (LL) results in very high stone clearance rates (73–97%). 4

Technique:

• EHL generates a shock wave following rapid thermal expansion of fluid caused by high-voltage spark, creating hydraulic pressure wave that causes stone fragmentation 4
• LL uses pulsed laser energy focused on the stone; thermal effect absorbed by water in stones causes expansion and shock wave that causes fragmentation 4
• Delivery of such energy must be conducted under direct vision to ensure safety and precise targeting 4

Safety:

• Cholangioscopy is safe but cholangitis has been reported in up to 9% of patients, necessitating prophylactic antibiotics 4
• Complications are comparable to conventional ERCP 4

EUS-Guided Biliary Drainage (EUS-BD)

• Developed as an alternative mainly for patients with difficult cases of ERCP 7
• Good option for patients with surgically altered anatomy 7
• Allows direct bile duct access and EUS-facilitated bile duct access for ERCP 6

Balloon Enteroscopy-Assisted ERCP

• Used for biliopancreatic diseases in patients with surgically altered anatomy 7
• Since development of balloon enteroscope-assisted ERCP, outcomes of procedures such as stone extraction or drainage have been favorable 7
• In patients with surgically altered anatomy, selective cannulation can be performed with overtube-assisted enteroscopy, laparoscopic surgery assistance, or EUS-directed transgastric ERCP 6

---

Alternative Approaches When Standard Methods Fail

Percutaneous Radiological Stone Extraction

• Reserved for patients in whom laparoscopic and endoscopic methods are unsuccessful or impossible 1
• Utilizes balloon dilation of the biliary sphincter with antegrade stone pushing 1

Extracorporeal Shock Wave Lithotripsy

• Available in some centers when standard stone extraction techniques supplemented by mechanical lithotripsy, EPBD with prior sphincterotomy, and cholangioscopy fail 4

---

Special Clinical Scenarios

Single-Session Treatment for CBD Stones with Cholecystectomy

• Single-session laparoscopic treatment with laparoscopic transcystic CBD exploration (LTCBDE) is preferred for concurrent common bile duct stones when technically feasible 3
• ERCP with sphincterotomy and stone extraction followed by cholecystectomy remains an alternative, particularly when laparoscopic CBD exploration expertise is unavailable 3
• Endoscopic sphincterotomy and stone clearance at the time of laparoscopic cholecystectomy is cost-saving and may be associated with lower incidence of ERCP complications 4

Patients with Surgically Altered Anatomy

• Extraction of ductal stones may be difficult in patients with altered anatomy as a result of previous surgery 4
• Both balloon enteroscopy-assisted ERCP and interventional EUS have advantages and disadvantages; choice should be based on patient condition and endoscopist expertise 7

---

Training and Competency Requirements

• Surgeons should acquire LCBDE skills to reduce total number of interventions required for CBD stone management 1
• All ERCP endoscopists should be competent in access papillotomy 1
• Structured training programs and mentorship are essential for skill development 1

---

Common Pitfalls and Caveats

• Never perform blind instrumentation of the bile duct—always use choledochoscopic visualization to prevent perforation and stricture formation 4, 1
• Conversion to open surgery should be considered if Critical View of Safety cannot be achieved during laparoscopic cholecystectomy 3
• ERCP alone without cholecystectomy results in significantly higher rates of recurrent biliary complications 2
• Elderly patients and those with severe comorbidities face significantly higher surgical mortality; careful risk-benefit assessment is essential 3
• Laparoscopic CBD exploration is generally indicated only in patients with a wide CBD to avoid subsequent development of strictures 1