Liver Diseases Causing Multiple Cysts
Polycystic liver disease (PLD) is the primary condition causing multiple hepatic cysts, defined by the presence of >10 cysts, and occurs either in isolation (autosomal dominant polycystic liver disease/ADPLD) or associated with autosomal dominant polycystic kidney disease (ADPKD). 1
Primary Diseases with Multiple Hepatic Cysts
Polycystic Liver Disease (PLD)
- Diagnostic criterion: >10 hepatic cysts 1
- Prevalence: 1/10,000–1/158,000 1
- Two forms:
- Gender predominance: Female-to-male ratio of 3:1, with estrogen driving cyst growth 2
- Inheritance: Autosomal dominant with 50% transmission risk 1
Caroli Disease and Caroli Syndrome
- Caroli disease: Characterized by saccular or fusiform dilatation of intrahepatic bile ducts appearing as multiple cystic structures 1
- Caroli syndrome: Combines bile duct dilatation with congenital hepatic fibrosis and kidney cysts, likely part of autosomal recessive polycystic kidney disease (ARPKD) spectrum 1
- Key differentiator: Hepatic fibrosis presence separates syndrome from disease 1
- Inheritance: Autosomal recessive (PKHD1 gene mutations) 1
- Complications: 7% cholangiocarcinoma risk (versus 0.05% general population) 1
Biliary Hamartomas (Von Meyenburg Complexes)
- Appearance: Multiple tiny (<1 cm) hypodense lesions scattered throughout liver 1
- Prevalence: 5.6% in general population 1
- Clinical significance: Typically asymptomatic, incidental findings that can mimic liver metastases 1
- Malignant potential: Very low risk despite being found in 40% of resected cholangiocarcinoma specimens 1
- Associated conditions: May occur with Caroli disease, congenital hepatic fibrosis, ADPKD, or ADPLD 1
Peribiliary Cysts
- Location: Exclusively in hepatic hilum and larger portal tracts 3
- Association: Linked to portal hypertension and cirrhosis 3
- Clinical presentation: Generally asymptomatic, though can cause obstructive jaundice if large 3
Common Pitfalls and Caveats
Critical distinction: Multiple simple hepatic cysts scattered throughout the liver do NOT constitute PLD unless >10 cysts are present. Simple hepatic cysts are common (prevalence 2.5–18%) and typically solitary or few in number 1.
Misdiagnosis risk: Cystic bile duct hamartomas and benign biliary cysts are frequently multifocal and commonly misdiagnosed as "hepatobiliary cystadenoma" when they show degenerative or inflammatory changes 4. True mucinous cystic neoplasms (MCNs) with ovarian-type stroma are solitary in 90% of cases and constitute only 10.5% of hepatic cysts 4.
Imaging approach:
- Ultrasound is first-line for diagnosis 1
- MRI superior to CT for detecting small cysts, especially in young patients and those with renal insufficiency 1
- Magnetic resonance cholangiopancreatography has highest diagnostic accuracy for Caroli disease, demonstrating continuity between cystic lesions and bile ducts 1
Surveillance considerations: