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Biliary Atresia – Causes, Symptoms and Treatment

Biliary atresia is a rare congenital condition in which the bile ducts are absent or blocked. Without treatment, it leads to severe liver damage and cirrhosis in infants.

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Things worth knowing about "Biliary Atresia"

Biliary atresia is a rare congenital condition in which the bile ducts are absent or blocked. Without treatment, it leads to severe liver damage and cirrhosis in infants.

What is Biliary Atresia?

Biliary atresia is a rare but serious liver disease that affects newborns. In this condition, the bile ducts – the channels that carry bile from the liver to the intestine – are either absent, obstructed, or destroyed by scarring. As a result, bile cannot drain properly, accumulates in the liver, and causes progressive liver damage that can lead to cirrhosis (liver scarring) within months if left untreated. Biliary atresia affects approximately 1 in 10,000 to 15,000 live births and is one of the most common reasons for liver transplantation in children.

Causes

The exact cause of biliary atresia remains incompletely understood. Current research suggests a combination of contributing factors:

Abnormal bile duct development: A disruption during fetal development leads to malformation or absence of the bile duct system.
Immune-mediated inflammation: A viral infection (e.g., reovirus or rotavirus) shortly before or after birth may trigger an abnormal immune response that attacks and destroys the bile ducts.
Progressive inflammatory scarring: Ongoing inflammation after birth can lead to complete obliteration of the bile ducts.
Genetic predisposition: Certain genetic variations may increase susceptibility, though the disease is not typically inherited directly.

Symptoms

Symptoms typically appear in the first few weeks of life and include:

Persistent jaundice: Yellowing of the skin and whites of the eyes that continues beyond the normal newborn period (2 weeks).
Pale or chalky stools: The absence of bile pigments causes stools to appear white, grey, or clay-coloured.
Dark urine: Bile pigments are excreted through the kidneys, causing dark-coloured urine.
Enlarged liver (hepatomegaly): Due to bile backflow and progressive liver inflammation.
Enlarged spleen (splenomegaly): As a consequence of portal hypertension in advanced stages.
Poor weight gain (failure to thrive): Caused by impaired absorption of dietary fats and fat-soluble vitamins.

Diagnosis

Early diagnosis is critical for a successful outcome. The following diagnostic approaches are used:

Blood tests: Elevated direct bilirubin, liver enzymes (AST, ALT, GGT), and alkaline phosphatase indicate bile flow obstruction.
Stool colour screening: Some countries use a stool colour card programme for newborns to identify pale stools early.
Liver and biliary ultrasound: Can reveal an absent or small gallbladder and abnormal bile duct architecture.
Liver biopsy: Tissue examination showing bile duct proliferation and fibrosis supports the diagnosis.
Intraoperative cholangiography: Imaging of the bile ducts performed during surgery to confirm the diagnosis definitively.
Hepatobiliary scintigraphy (HIDA scan): A nuclear medicine test that evaluates bile flow from the liver.

Treatment

Kasai Procedure (Hepatoportoenterostomy)

The primary surgical treatment is the Kasai procedure, also known as hepatoportoenterostomy, ideally performed within the first 60 days of life. During this operation, the damaged bile ducts are removed and a loop of the small intestine is connected directly to the liver to restore bile drainage. The earlier the procedure is performed, the better the prognosis.

Liver Transplantation

If the Kasai procedure does not provide sufficient bile drainage or liver function continues to deteriorate, a liver transplantation becomes necessary. Biliary atresia is the leading indication for paediatric liver transplantation worldwide. Living-donor transplants (e.g., from a parent) can help reduce waiting times significantly.

Supportive Therapies

Antibiotic prophylaxis: Prescribed after the Kasai procedure to prevent cholangitis (infection of the bile ducts).
Ursodeoxycholic acid: Used to promote bile flow and provide hepatoprotective effects.
Nutritional support: Supplementation with fat-soluble vitamins (A, D, E, K) and specialised infant formula containing medium-chain triglycerides (MCT) to support growth and nutrient absorption.

Prognosis

The prognosis depends heavily on the timing of diagnosis and intervention. When the Kasai procedure is performed early and successfully, approximately 40–50% of children can live with their native liver into adulthood. However, many patients ultimately require a liver transplant. With modern surgical techniques and medical care, the majority of affected children now survive into adulthood with good quality of life.

References

Sokol RJ et al. - Biliary atresia: Summary of a symposium. Hepatology. 2006;44(3):755-762. (PubMed)
Hartley JL, Davenport M, Kelly DA - Biliary atresia. Lancet. 2009;374(9702):1704-1713.
World Health Organization (WHO) - Guidelines on newborn health and liver disease management. WHO Publications, Geneva.

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