Select topography:
 
The C numbers are the respective ICD-O topography codes [1]

1. Fritz A, Percy C, Jack A, Shanmuragatnam K, Sobin LH, Parkin DM, Whelan S (Eds) International Classification of Diseases for Oncology. World Health Organization: Geneva 2000




C23-C24.0 Gallbladder and extrahepatic biliary tract
C24.1 Ampulla of Vater