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. 2018 Sep 25;13:188. doi: 10.1186/s13014-018-1136-5

Fig. 1.

Fig. 1

Cheng’s classification of hepatocellular carcinoma with portal vein tumor thrombus. a type I, tumor thrombus involving segmental or sectoral branches of the portal vein or above; b type II, tumor thrombus involving the right/left portal vein; c type III, tumor thrombus involving the main portal vein; d type IV, tumor thrombus involving the superior mesenteric vein