Schema Discriminator 1: BileDuctsDistal/BileDuctsPerihilar/CysticDuct
This input is used for staging
Description
Cystic duct, distal bile ducts, and perihilar bile ducts all have the same ICD-O topography code (C240). However, for purposes of stage grouping in the AJCC 8th edition, they each have different chapters for stage. A schema discriminator is necessary to distinguish between these primary sites so that the appropriate chapter/schema is used.Rationale
A schema discriminator is used to assign AJCC ID when site and histology alone are insufficient to identify the applicable AJCC staging method and to assign Schema ID, which links each case to the appropriate SSDIs, Summary Stage and EOD data collection system.Notes
**Note:** **Schema Discriminator for C240** * A schema discriminator is used to discriminate for primary site C240 (extrahepatic bile ducts) for the subsite in which the tumor arose. * **00242 : Cystic Duct (see code 3)** Per the AJCC Gallbladder Staging System, the gallbladder tapers into the cystic duct * **00250: Bile Ducts Perihilar (see codes 1, 5, 6, 9)** Per the AJCC Perihilar Bile Ducts Staging System, 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 * **00260: Bile Ducts Distal ( see codes 4, 7)** Per the AJCC Distal Bile Duct Staging System, 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.)Default
9NAACCR Item
NAACCR #3926Metadata
SSDI| Code | Description | Schema ID #/Description |
|---|---|---|
| 1 | Perihilar bile duct(s) Proximal extrahepatic bile duct(s) Hepatic duct(s) | 00250: Bile Ducts Perhilar |
| 3 | Cystic bile duct; cystic duct | 00242: Cystic Duct |
| 4 | Distal bile duct Common bile duct Common duct, NOS | 00260: Bile Duct Distal |
| 5 | Diffuse involvement More than one subsite involved, subsite of origin not stated | 00250: Bile Ducts Perhilar |
| 6 | Stated as middle extrahepatic bile duct AND treated with combined hepatic and hilar resection | 00250: Bile Ducts Perhilar |
| 7 | Stated as middle extrahepatic bile duct AND treated with pancreaticoduodenectomy | 00260: Bile Duct Distal |
| 9 | Extrahepatic bile ducts, NOS | 00250: Bile Ducts Perhilar |