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# Neonatal cholestasis: biliary atresia and neonatal hepatitis

- Lesion

A baby with jaundice beyond two weeks, pale stools and dark urine needs urgent study: blocked ducts must be found early.

Updated Nov 12, 2026

## Key points

- Any newborn with jaundice beyond two weeks needs a conjugated bilirubin measurement.
- Biliary atresia: progressive inflammatory and fibrosing obliteration of extrahepatic ducts in the first weeks of life.
- Biopsy in atresia: ductular reaction, bile plugs in ductules, portal edema and fibrosis (obstructive pattern).
- Neonatal hepatitis: lobular disarray with multinucleated giant hepatocytes and cholestasis.
- Treatment of atresia: Kasai portoenterostomy, best done early; many still need transplantation.
- Some atresia cases occur with laterality defects (polysplenia, situs anomalies).

## What it is

Neonatal cholestasis is prolonged conjugated hyperbilirubinemia in a newborn. Its two main groups are obstructive, above all extrahepatic biliary atresia, and nonobstructive 'neonatal hepatitis' from infections, metabolic and genetic diseases (alpha-1 antitrypsin deficiency, galactosemia, cystic fibrosis, bile transport defects, Alagille syndrome). Biliary atresia is the most common cause of death from liver disease in early childhood and the leading indication for pediatric liver transplantation; surgery in the first weeks improves the outcome.

## Step by step

- An insult around birth (suspected virus or immune attack) targets the extrahepatic bile ducts.
- Inflammation and fibrosis obliterate the duct lumen.
- Bile cannot drain: conjugated jaundice, acholic stools, dark urine.
- Intrahepatic obstruction causes ductular reaction and progressive fibrosis.
- Without surgery, biliary cirrhosis develops within the first year.

## Obstructive vs nonobstructive neonatal cholestasis

| Feature | Biliary atresia | Neonatal hepatitis |
| --- | --- | --- |
| Cause | Inflammatory destruction of extrahepatic ducts (possibly viral or immune) | Infections, metabolic and genetic disorders, or idiopathic |
| Stools | Persistently pale (acholic) | Often variably pigmented |
| Biopsy | Ductular reaction, bile plugs in ductules, portal fibrosis | Giant-cell transformation, lobular disarray, cholestasis |
| Imaging | No excretion of tracer into bowel; small or absent gallbladder | Excretion usually present |
| Treatment | Kasai procedure, transplantation | Treat the cause |

## Memory aid

Yellow after two weeks, white stools, dark nappies: think atresia and act fast.

## Test yourself

Think of the answer, then tap the question to see it.

## What is the most common cause of death from liver disease in early childhood?

Extrahepatic biliary atresia.

## What histologic feature favours neonatal hepatitis over biliary atresia?

Giant-cell transformation of hepatocytes with lobular disarray, rather than marked ductular reaction and bile plugs in ductules.

## Why should biliary atresia be operated on early?

The Kasai portoenterostomy works best before fibrosis advances; delay leads to biliary cirrhosis.

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## Elsewhere in DurgiPedia

- [Biliary atresia](https://durgical.com/en/embryology/biliary-atresia/)

## Connections

## Related 3

- [Jaundice and cholestasis](https://durgical.com/en/general-pathology/jaundice-and-cholestasis/)
- [Alpha-1 antitrypsin deficiency: the liver](https://durgical.com/en/general-pathology/alpha-1-antitrypsin-deficiency-the-liver/)
- [Choledochal cysts and fibropolycystic disease](https://durgical.com/en/general-pathology/choledochal-cysts-and-fibropolycystic-disease/)

## Related conditions 6

- [Biliary atresia](https://durgical.com/en/conditions/biliary-atresia/)
- [Neonatal jaundice](https://durgical.com/en/conditions/neonatal-jaundice/)
- [α1-antitrypsin deficiency](https://durgical.com/en/conditions/1-antitrypsin-deficiency/)
- [Classic galactosaemia](https://durgical.com/en/conditions/classic-galactosaemia/)
- [Congenital (TORCH) infections: syphilis, toxoplasmosis, CMV and Zika](https://durgical.com/en/conditions/congenital-infections-syphilis-toxoplasmosis-cmv-and-zika/)
- [Cystic fibrosis](https://durgical.com/en/conditions/cystic-fibrosis/)

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Educational content on the mechanisms of disease; not a diagnostic or treatment guide and no substitute for a health professional's advice. No doses are given.

Sources: [Biliary atresia: MedlinePlus Medical Encyclopedia](https://medlineplus.gov/ency/article/001145.htm) (MedlinePlus, US National Library of Medicine, 2026); [Newborn jaundice: MedlinePlus Medical Encyclopedia](https://medlineplus.gov/ency/article/001559.htm) (MedlinePlus, US National Library of Medicine, 2026).

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Source: https://durgical.com/en/general-pathology/neonatal-cholestasis-biliary-atresia-and-neonatal-hepatitis/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/general-pathology/neonatal-cholestasis-biliary-atresia-and-neonatal-hepatitis/