Surgery According to Bismuth classification, type IV cholangiocarcinoma involves: A Common hepatic duct B Bifurcation only C Bifurcation and bilateral secondary intrahepatic duct D Bifurcation and unilateral secondary intrahepatic ducts 💡 Explanation According to Bismuth classification, type IV cholangiocarcinoma involves: ✓ Correct Answer: C. Bifurcation and bilateral secondary intrahepatic duct