Gadoxetic acid magnetic-enhanced resonance imaging in the diagnosis of cholangiocarcinoma

Table 1 Liver cancer study group of Japan tumour node metastases staging for intrahepatic cholangiocarcinoma

	Type	Result
T	Number of tumors	Solitary
	Size of tumor	2 cm or less
	Negative invasion	Portal vein, hepatic vein, serous membrane
N	N0	No metastasis to nodes
	N1	Metastasis to nodes
M	M0	No distant metastasis
	M1	Positive distant metastasis

T1: A tumor that meets all 3 requirement; T2: Meets 2/3 requirements; T3: Meets 1/3 requirements; T4: Meets none of the requirements.

Table 2 Bismuth-Corlette classification system for perihilar cholangiocarcinoma

Type	Definition
I	Below the confluence of the left and right hepatic ducts
II	Reaching confluence but not involving left or right hepatics ducts
III	Occluding common hepatic duct and either right (A) or left (B) hepatic duct
IV	Multicentric or bilateral intrahepatic segmental involvement; or involving confluence and both right and left hepatics ducts

Table 3 Memorial Sloan Kettering T stage for hilar cholangiocarcinoma

Stage	Criteria
T1	Tumor involving biliary confluence and/or unilateral extension to second-order biliary tracts
T2	T1 and/or ipsilateral portal vein involvement and/or ipsilateral hepatic lobar atrophy
T3	Tumor involving biliary confluence, the biliary extension to second-order biliary tracts; or unilateral extension to second-order biliary tracts with contralateral portal vein involvement; or unilateral extension to second-order radicals with contralateral hepatic lobar atrophy; or main or bilateral portal vein involvement