The Bismuth-Corlette classification of hilar cholangiocarcinoma (Klatskin tumour) is used to plan resection. A type IIIb tumour extends into:

• A The confluence of left and right hepatic ducts only
• B The right second-order biliary radicles
• C Both right and left second-order radicles (unresectable)
• D The left second-order biliary radicles ✓

Explanation

In the Bismuth-Corlette classification: Type I — below confluence; Type II — confluence; Type IIIa — extends into right second-order ducts; Type IIIb — extends into left second-order ducts; Type IV — bilateral second-order involvement. Type IIIb requires left hepatectomy for complete excision, while IIIa requires right hepatectomy. Type IV was traditionally considered unresectable but selected cases may be resected with extended hepatectomy.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

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