Contrast-enhanced sonography versus biopsy for the differential diagnosis of thrombosis in hepatocellular carcinoma patients

Table 1 Enrollment design

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Inclusion criteria	Presence of one to three focal HCC Presence of intra-vascular1 portal vein thrombosis Child-Pugh class A or B
Patients initially enrolled	Men: 190 Women: 66
Excluded for US evidence direct HCC portal vein invasion	70
Drop out on follow-up	78 (42%)
Died	30
Liver could not be adequately visualized	9
Patients studied	Mean age: 66 ± 6 Men: 82 Women: 26

¹Not US features of infiltration of perivascular parenchyma: intact vessel wall.