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Malignant tumours are cancerous growths that have the potential to spread (metastasize) to other parts of the body. Extrahepatic bile duct cancers start in bile ducts outside the liver. They are either:
Intrahepatic bile duct cancer occurs in the bile ducts within the liver. This type of bile duct cancer is staged and treated somewhat differently than extrahepatic bile duct cancer.
The following information applies to extrahepatic bile duct tumours.
Adenocarcinoma is a type of cancer that starts in the gland cells that line the inside of the bile ducts. Adenocarcinomas are the most common type of bile duct cancers and account for over 90% of all malignant bile duct tumours. Adenocarcinomas are grouped into different subtypes based on how they look under the microscope or the types of characteristics they have.
The following types of extrahepatic bile duct tumours are rare:
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