Cholangiocarcinoma is a form of cancer that is composed of mutated epithelial cells ( or cells showing characteristics of epithelial differentiation ) that originate in the bile ducts which drain bile from the liver into the small intestine .
Cholangiocarcinoma or bile duct cancer is a form of cancer that is formed by mutated epithelial cells ( or cells showing characteristics of epithelial differentiation ) that begins in the bile ducts which drain bile from the liver into the small intestine .