Which of the following is not the indication of portal vein tumor thrombosis caused by liver cancer?

A、 Concentric black shadows in the inferior vena cava ;
B、The main diameter of the portal vein is not proportional to the diameter of the branch. ;
C、Portal vein branch is larger than the main one.;
D、Portal vein is widened and density is uneven.;
E、 Filling defect in portal vein.