Table 4.

A New Staging System for Mass‐Forming–Dominant Intrahepatic Cholangiocarcinoma

Variable	Parameter
Criteria
1. No. of tumors	Solitary
2. Size of largest tumor	≤2 cm
3. Vascular or major biliary invasion	vp0, va0, b0‐b2
Tumor classification
T1	All 3 criteria are fulfilled
T2	Only 2 of the 3 criteria are fulfilled
T3	Only 1 of the 3 criteria is fulfilled
T4	None of the 3 criteria are fulfilled
Stage
I	T1N0M0
II	T2N0M0
III	T3N0M0
IVA	T4N0M0
	T1‐T3N1M0
IVB	T4N1M0
	AnyTN0,N1M1

Abbreviations: b0‐b2, no biliary invasion or minor biliary invasion within second‐order branch of the bile duct; M, metastasis status; N, lymph node status; T, tumor classification; va0, no arterial invasion; vp0, no portal vein invasion.