Hepatolithiasis

Epidemiology

• Highly prevalent in East Asia (China, Taiwan, Japan, Korea, Southeast Asia) and their emigrant populations worldwide; rare in the West.
• In Western populations, most ductal stones are extrahepatic; intrahepatic stones, when they do occur, are usually secondary to other biliary pathology.
• Affects both sexes equally.
• Approximately 20% of patients remain asymptomatic (Japanese survey data).
• 70% of patients with hepatolithiasis do NOT have gallstones.

Etiology & Pathogenesis

• Chronic biliary stasis - the central mechanism, leading to stone nucleation
• Biliary strictures (benign, postoperative, or associated with PSC)
• Recurrent pyogenic cholangitis (RPC) - bile duct strictures cause proximal stasis → recurrent cholangitis → pyogenic inflammation → de novo pigment stone formation. Transient portal bacteremia transfers organisms to the bile ducts, facilitating stone growth. Causative organisms: E. coli, Klebsiella, Proteus, Pseudomonas, anaerobes.
• Choledochal cysts / Caroli disease
• Biliary parasites (Clonorchis sinensis, Opisthorchis viverini)
• Congenital duct abnormalities
• Defects in hepatic phospholipid transporters (proposed)
• Diet has also been implicated

Stone Composition

• Predominantly pigmented calcium bilirubinate stones (brown pigment stones) - distinct from the cholesterol stones typical of Western gallstone disease.

Pathology (Morphology)

• Distended intrahepatic bile ducts containing pigmented calcium bilirubinate stones
• Duct wall: chronic inflammation, mural fibrosis, peribiliary gland hyperplasia
• No obstruction of the extrahepatic ducts (primary disease)
• Repeated bouts of inflammation → parenchymal collapse and fibrosis → can produce a mass-like lesion mimicking tumor on imaging

Fig. Biliary cirrhosis secondary to hepatolithiasis: (A) Sagittal liver section showing nodularity and bile staining of end-stage biliary cirrhosis. (B) Irregular "jigsaw puzzle" shaped nodules on histology, characteristic of biliary cirrhosis. - Robbins, Cotran & Kumar Pathologic Basis of Disease

Clinical Presentation

• Recurrent ascending cholangitis - the hallmark: fever, right upper quadrant pain, jaundice (Charcot's triad)
• Severity ranges from mild to life-threatening sepsis
• Hepatic abscess formation
• Progressive hepatic parenchymal destruction, biliary cirrhosis
• Liver failure (late)
• 20% can remain asymptomatic

Classification

Japanese Classification (by location)

Takada Classification (by stricture pattern)

• Mulholland and Greenfield's Surgery, p. 3081

Diagnosis

• Imaging features are similar to extrahepatic stones (filling defects, upstream dilatation)
• CT/MRI may show lobar atrophy in long-standing cases
• A mass-like lesion must raise suspicion for cholangiocarcinoma

Complications

1. Recurrent ascending cholangitis - the most common complication
2. Liver abscess
3. Biliary cirrhosis and portal hypertension
4. Cholangiocarcinoma - incidence 5-10% in patients with hepatolithiasis; particularly high risk in Taiwan, also Japan. Hepatolithiasis is a known risk factor alongside PSC, choledochal cysts, and Opisthorchis infection. Stone removal may reduce this risk.
5. Liver failure
6. Lobar atrophy from chronic obstruction

Management

Acute Phase

• Resuscitation and treatment of cholangitis (IV antibiotics, fluid support)
• Biliary drainage - percutaneous or endoscopic, depending on stone location and stricture distribution

Definitive Treatment

• For accessible stones, especially those near the hilum
• Cholangioscopy (SpyGlass or similar) with electrohydraulic lithotripsy (EHL) or laser lithotripsy often required given the proximal location
• ESWL may be used as adjunct to fragment stones for ERCP retrieval
• Limitations: high recurrence; may not be feasible in complex bilateral or stricture-associated disease

• Particularly valuable when ERCP access is limited
• Direct cholangioscopic stone removal via a transhepatic tract
• Recent evidence supports this as an effective approach for difficult hepatolithiasis

• Hepatectomy (partial/segmental): indicated when
  • Stones are limited to one lobe/segment with atrophy or irreversible parenchymal damage
  • Concern for cholangiocarcinoma
  • Failed endoscopic/percutaneous approaches
  • Recurrent pyogenic cholangitis confined to a segment
• Hepaticojejunostomy (Roux-en-Y) ± anchoring the jejunal limb to the abdominal wall (creates a "hepaticojejunostomy access loop") for future percutaneous stone retrieval
• Transduodenal sphincteroplasty for impacted stones at the ampulla, primary duct stones, or benign distal strictures

Key Decision Points for ERCP vs Surgery

• Is segmental hepatectomy the better option (e.g., RPC, lobar atrophy, cholangiocarcinoma risk)?
• Is there underlying cholangiopathy or malignancy?
• What is the distribution and number of strictures (Takada classification guides this)?
• Clinical Gastrointestinal Endoscopy, p. 1571

Recurrence

• Recurrence rates are high even after complete stone clearance
• Rates vary widely in the literature (0% to >50%)
• This drives the preference for surgery with biliary enteric bypass in appropriate patients, allowing future percutaneous access

Key Associations - Risk Factors for Cholangiocarcinoma

• Sleisenger and Fordtran's Gastrointestinal and Liver Disease

Summary