Klatskin tumor is -

Ans. is 'a' i.e., Nodular type of cholangiocarcinoma o Klatskin tumour is an extrahepatic type of cholangiocarcinoma.o According to their localization, cholongiocarcinomas are classified intoIntrahepatic (10-20 %)Extrahepatic (80-90%)o The extrahepaticforms include perihilar tumors known as Klastkin tumors, which are located at the junction of the right and left hepatic ducts forming the common hepatic duct, and distal duct tumors.o A subgroup of distal tumors arise in the immediate vicinity of ampulla of vater. Tumor of these region also include adenocarcinoma of duodenal mucosa and pancreatic carcinoma and are collectively referred to as periampullary carcinomas.