Caroli disease

Disease Description (Causes and Symptoms)

• Definition: A congenital disease in which the intrahepatic bile ducts undergo multiple, segmental cystic (sac-like) dilations. It is classified into the simple type (isolated form) and the complex type (Caroli syndrome), which is accompanied by hepatic fibrosis and portal hypertension.
• Cause/Inheritance: Although the exact disease mechanism is unknown, congenital and genetic predisposition are important. According to reports, the simple type may show an autosomal dominant inheritance pattern, while the complex type may show an autosomal recessive inheritance pattern (as reported in the literature). Pathophysiologically, abnormal growth of the bile duct epithelium and supporting connective tissue causes bile duct dilation and leads to bile stasis.
• Main symptoms: Recurrent upper abdominal pain, abdominal bloating, jaundice, and weight loss. Bile stasis increases the risk of recurrent cholangitis (fever, chills, and right upper quadrant pain), bile duct stones, and liver abscesses, and over the long term increases the risk of biliary epithelial dysplasia and cholangiocarcinoma (bile duct cancer). Portal hypertension (such as esophageal varices) may accompany the complex type.
• Findings helpful for diagnosis (summary): Abdominal ultrasound, CT, MRI/MRCP, ERCP, and other imaging tests can identify multiple cystic dilations of the intrahepatic bile ducts and adjacent dilated portal vein branches.

Treatment Methods (Standard Treatment · Medications · Procedures/Surgery · Lifestyle Management and Precautions)

• Conservative treatment
  • When there is no recurrent cholangitis and complications are mild: Regular monitoring, including ursodeoxycholic acid to improve bile flow and fat-soluble vitamin supplementation when necessary.
  • When cholangitis occurs: Appropriate antibiotics based on blood tests and imaging, and bile duct drainage when necessary (endoscopic drainage (ERCP) or percutaneous transhepatic biliary drainage (PTBD)).
• Procedures/Surgery
  • When the lesions are limited to one hepatic lobe and recurrent cholangitis or symptoms persist: Liver resection of the affected area (partial or segmental resection).
  • When the lesions are extensive and overall liver function decline and complications (portal hypertension, recurrent infections, cancer risk, etc.) are severe: Liver transplantation may be considered.
  • Complication management: If esophageal varices are present, management of portal hypertension, including endoscopic treatment (ligation or sclerotherapy), is necessary.
• Follow-up and cancer surveillance
  • Because the risk of cholangiocarcinoma is increased, regular imaging (MRI/MRCP, ultrasound, etc.) and clinical follow-up are recommended.
• Lifestyle management and self-care precautions
  • Visit a medical institution immediately if symptoms suggesting infection, such as fever, right upper quadrant pain, or jaundice, occur.
  • Avoid alcohol and hepatotoxic medications (such as unnecessary painkillers and supplements).
  • Consider hepatitis A and B vaccinations to prevent conditions that burden the liver (such as acute viral hepatitis).
  • Maintain adequate fluid intake and nutrition, and diligently undergo regular tests and imaging follow-up.
• Risk of complications (caution)
  • Recurrent cholangitis → liver abscesses and sepsis, bile duct and gallbladder stones, hepatic fibrosis and portal hypertension (esophageal varices), and possible biliary epithelial dysplasia and cholangiocarcinoma.

Checklist Before an Outpatient Visit (Items to Prepare and Checkpoints, with Example Questions)

• Items to prepare/submit
  • List of currently taken medications (including prescription drugs, OTC medications, and nutritional supplements)
  • History of previous surgeries and hospitalizations, and family history (liver disease, congenital diseases, cholangiocarcinoma, etc.)
  • Existing test results (blood tests, liver function tests, and ultrasound, CT, MRI, and ERCP reports)
  • Symptom diary: Frequency, intensity, and location of pain; timing and duration of fever and jaundice; changes in weight
  • Records of allergies (medications, contrast media, etc.)
• Items to check before the outpatient visit
  • Whether there has been recent fever or chills, presence of jaundice, and changes in urine or stool color
  • Whether antibiotics, steroids, or other medications have recently been administered
  • Vaccination history (hepatitis vaccines)
• Example questions (for the patient to check personally)
  • "How many episodes of fever and right upper quadrant pain have you had recently?"
  • "Do any of the medications I am currently taking affect blood clotting or the liver?"

Examples of General Questions to Ask the Doctor

• "Are my lesions limited to one side of the liver, or are they extensive? Is surgical resection possible?"
• "What is the standard treatment when cholangitis recurs, including antibiotic selection and drainage methods?"
• "How often should I have regular follow-up tests, and which tests would be appropriate?"
• "Are there any medications or dietary habits I should avoid in daily life?"

Examples of Disease-Specific Questions

• "Could you explain which hepatic lobe or segment the lesions are limited to on my imaging (ultrasound/CT/MRI), and whether partial resection is possible?"
• "How often should I undergo tests, such as blood tumor markers and MRCP, to reduce the risk of cholangiocarcinoma?"