Schema Discriminator 1: BileDuctsDistal/BileDuctsPerihilar/CysticDuct

This input is used for staging


**Note:** A schema discriminator is used to discriminate for primary site C240 (extrahepatic bile ducts) for the subsite in which the tumor arose. * **Chapter 24: Gallbladder (see code 3)** Per AJCC 8th edition, the gallbladder tapers into the cystic duct * **Chapter 25: Perihilar Bile Ducts (see codes 1, 5, 6, 9)** Per AJCC 8th edition, perihilar (or proximal) cholangiocarcinomas involve the main biliary confluence of the right and left hepatic ducts and comprise 50-70% of all cases of bile ducts carcinomas * **Chapter 26: Distal Bile Ducts ( see codes 4, 7)** Per AJCC 8th edition, these tumors have their center located between the confluence of the cystic duct and common hepatic duct and the Ampulla of Vater (excluding ampullary carcinomas.)




NAACCR #3926


Code Description Disease
1 Perihilar bile duct(s) Proximal extrahepatic bile duct(s) Hepatic duct(s) 25: Perihilar Bile Ducts
3 Cystic bile duct; cystic duct 24: Cystic Duct
4 Distal bile duct Common bile duct Common duct, NOS 26: Distal Bile Ducts
5 Diffuse involvement More than one subsite involved, subsite of origin not stated 25: Perihilar Bile Ducts
6 Stated as middle extrahepatic bile duct AND treated with combined hepatic and hilar resection 25: Perihilar Bile Ducts
7 Stated as middle extrahepatic bile duct AND treated with pancreaticoduodenectomy 26: Distal Bile Ducts
9 Extrahepatic bile ducts, NOS 25: Perihilar Bile Ducts