Definition
Biliary tract cancer (cholangiocarcinoma) is a rare malignant tumor that develops in the bile ducts. It is classified as intrahepatic (within the liver) or extrahepatic (outside the liver) based on its location.

Pathogenesis
The development of biliary tract cancer is linked to:

  • Chronic inflammatory conditions: Such as primary sclerosing cholangitis (PSC).
  • Parasitic infections: Certain liver parasites (e.g., Opisthorchis viverrini).
  • Other factors: Chronic gallstones, exposure to toxins, and genetic mutations.

Diagnosis
Diagnosis is made using:

  • Imaging techniques: Ultrasound, CT, MRI, or MRCP (magnetic resonance cholangiopancreatography) to identify the lesion.
  • Laboratory tests: Elevated cholestatic markers (bilirubin, ALP, GGT) and tumor markers like CA 19-9.
  • Biopsy or cytology: Confirms the diagnosis.

Treatment
Treatment depends on the tumor’s location and stage:

  • Surgical resection: The only curative option for localized disease.
  • Liver transplantation: Indicated for select extrahepatic cholangiocarcinomas in clinical trial settings.
  • Adjuvant therapy: Chemotherapy or radiotherapy for unresectable cases or to reduce recurrence risk.
  • Targeted therapies: Used for cases with specific genetic mutations.

Prevention
Prevention includes:

  • Treatment of parasitic infections.
  • Management of chronic conditions: Such as PSC.
  • Avoiding toxins and periodic screening in high-risk individuals.

Early diagnosis is challenging due to a lack of early symptoms but is crucial for improving survival. In advanced stages, treatment focuses on symptom management and improving quality of life.

A malignant stricture must be distinguished from bile duct stones, which also obstruct but usually cause pain. Primary sclerosing cholangitis in inflammatory bowel disease is a recognised risk factor.

Frequently asked questions

What is the first sign?

Most often painless jaundice, with dark urine and pale stools, frequently preceded by intense itching. The absence of pain is what distinguishes it from obstruction caused by a gallstone, which usually hurts. Painless jaundice in an adult always requires prompt investigation.

How is the diagnosis confirmed?

Through a combination of MRCP, endoscopic ultrasound and ERCP with cholangioscopy. The last allows direct inspection of the duct lumen and targeted biopsies from the stricture itself, which imaging cannot provide. CA 19-9 is an adjunct and is not diagnostic on its own.

Is every bile duct stricture cancer?

No. Benign strictures occur, for example after surgery or in primary sclerosing cholangitis. Distinguishing them by imaging alone is not always possible, which is precisely where cholangioscopy with targeted biopsy has its greatest value.

Sources


Content last updated: September 2026 (14/09/2026).