Choledochal cyst

Disease Description (Causes and Symptoms)

• Definition and causes
  A choledochal cyst is a congenital malformation in which the extrahepatic or intrahepatic bile ducts become roundly or ovally dilated. It is often accompanied by an anomalous pancreatobiliary junction (APBJ), and the dilation is thought to occur because chronic irritation of the bile duct mucosa by reflux of pancreatic juice causes the bile duct to expand (according to the provided data: cysts are present in approximately 70% of cases with APBJ, and APBJ is present in 50–80% of patients with cysts).
• Classification (main types, summary of the Todani classification)
  Type 1: Cystic or fusiform dilation of the common bile duct (most common)
  Type 2: Diverticulum of the common bile duct (rare)
  Type 3: Dilation of the bile duct within the duodenal wall (choledochocele) — may be treated endoscopically
  Type 4: Multiple dilations of the extrahepatic and/or intrahepatic bile ducts (combined type)
  Type 5: Cysts limited to the intrahepatic bile ducts (= Caroli disease; may be accompanied by hepatic fibrosis)
• Main symptoms and course
  Classic triad of symptoms: right upper quadrant pain, jaundice, and a palpable mass (common in children).
  Children: biliary jaundice, abdominal pain, vomiting, and a palpable lesion. Adults: may be discovered incidentally without symptoms or identified because of jaundice, dark urine, gray stools, abdominal pain, pancreatitis, or symptoms of cholangitis. Approximately 60–75% of patients are diagnosed during childhood; symptoms begin before age 10 in approximately 60% and after age 20 in 25% (according to the provided data).
• Risk of complications
  Recurrent cholangitis, gallstones, pancreatitis, intrahepatic abscesses, cirrhosis and portal hypertension, gallbladder cancer, and bile duct cancer (increased cancer risk in this patient group). If untreated, there is a high risk of progressive bile duct obstruction and liver damage.

Treatment Methods

• Standard treatment principles
  Surgical excision is generally recommended for choledochal cysts because of the risks of malignant transformation (bile duct cancer and gallbladder cancer) and complications. However, type 3 lesions (choledochocele) can often be treated with endoscopic sphincterotomy (according to the provided data).
• Surgical treatment
  • Type 1 and type 4 lesions (mainly involving the extrahepatic bile ducts), etc.: Complete excision of the cyst followed by connection of the normal bile ducts to the small intestine through a Roux-en-Y hepaticojejunostomy or a similar procedure.
  • Type 5 (Caroli disease): Depending on the extent of the lesions, partial hepatectomy (when localized to one side) or liver transplantation may be considered (when diffuse or accompanied by fibrosis).
  • Accurate preoperative imaging evaluation (MRCP, CT, and ERCP when necessary) is needed to assess the extent of the cyst and the status of the pancreatobiliary junction.
• Medical and nonsurgical treatment (supportive)
  • For acute cholangitis: Administer antibiotics and, when necessary, perform percutaneous or endoscopic drainage (ERCP or PTBD).
  • If there is a history of pancreatitis, follow pancreatic treatment guidelines.
  • ERCP may be used for diagnosis and treatment (stent insertion and sphincterotomy).
• Follow-up and preventive care
  • Because the risk of bile duct cancer may remain over the long term even after surgery, periodic clinical evaluations, imaging (ultrasound or MRI), and liver function tests are needed.
  • If signs of complications occur, such as fever, jaundice, or severe abdominal pain, seek medical attention immediately.
• Precautions (including self-care)
  • When surgery is recommended, delaying it increases the risk of cholangitis, liver damage, and cancer.
  • If cholangitis is suspected, antibiotics and drainage may be needed immediately.
  • Maintaining liver health is recommended, including abstaining from alcohol (to protect the liver and pancreas) and receiving hepatitis vaccinations when necessary.

Outpatient Visit Checklist (Including Items to Bring and Example Questions)

• Items / information to bring
  • A list of all medications currently being taken (including prescription drugs, OTC medicines, and dietary supplements) and allergy information
  • Records of previous surgeries, hospitalizations, and diagnoses (especially those related to the bile ducts or pancreas)
  • Results of previous imaging tests (ultrasound, CT, MRI/MRCP, and ERCP films or reports)
  • A recent symptom record: onset, frequency, and severity of fever, jaundice, and abdominal pain; changes in urine or stool color; vomiting; weight changes; etc.
  • If applicable, whether pregnancy is possible
• Preliminary tests that may be performed during an outpatient visit (in consultation with a doctor)
  • Blood tests: liver function tests (AST/ALT, ALP, GGT), total/direct/indirect bilirubin, CBC, CRP, blood coagulation tests, blood glucose, and amylase/lipase (when pancreatitis is suspected)
  • Imaging: abdominal ultrasound (often the first test), and, when necessary, MRCP (noninvasive evaluation of the pancreatic and bile ducts) or CT
• Information to tell the doctor first during the outpatient visit
  • Recent fever/chills, severe right upper quadrant pain, worsening jaundice, changes in urine or stool color, and possibility of pregnancy
• Simple examples of questions to ask during the outpatient visit
  • “What tests should I have first based on my current symptoms?”
  • “Do I need surgery, and is this an emergency?”

General Examples of Questions to Ask the Doctor

• About this disease
  • “What type of Todani classification is mine?”
  • “Do I have an anomalous pancreatobiliary junction (APBJ)? How can this be confirmed through testing?”
• Regarding treatment and prognosis
  • “Is surgery absolutely necessary? What are the risks of delaying it?”
  • “Does the risk of cancer disappear completely after surgery? How often should I have follow-up examinations?”
• Regarding tests and procedures
  • “Which test should be performed first, MRCP or ERCP? What is the therapeutic benefit of ERCP?”
• Regarding medications and recovery
  • “Are there any medications I should stop taking before or after surgery?”
  • “How long will recovery take after surgery, and when can I return to my daily activities?”

Examples of Disease-Specific Questions

• “Which Todani type is my choledochal cyst, and can you accurately determine the extent of the cyst, including whether it involves the intrahepatic bile ducts, with MRCP?”
• “If an anomalous pancreatobiliary junction is confirmed, will completely removing the cyst through surgery also resolve the problem of pancreatic juice reflux? How likely is recurrence?”

(Note: The information above is a summary based on the provided materials and general medical knowledge. Follow the advice of your treating doctor for individual diagnosis and treatment.)