Discussion. Venous tumor thrombosis occasionally occurs in patients with renal cell carcinoma, pancreatic carcinoma, gastric carcinoma, hepatocellular carcinoma (HCC), adrenal cortical carcinoma, and testicular carcinoma [10,11,12,13,14].To the best of our knowledge, it is rare for a case to exhibit portal vein tumor recurrence without liver parenchymal invasion following surgical resection..