Abstract
A 69-year-old man was operated for the duodenal stenosis due to post-bulbar duodenal ulcer. At the operation a left-sided gallbladder and a small defect of the hepatic parenchyma on the left lateral segment were found. Three D-CT taken after the operation revealed abnormal intrahepatic portal venous branching. The first branch of the portal vein ran to the right posterior segment and then branched to the lateral and medial segments diverged at almost same portion. After this divergence, the portal vein ran transversely to the right and ramified to the right anterior segment. The umbilical sulcus in which contained the round ligament lay to the right of P 4. On these findings, this reported case was diagnosed as a right-sided round ligament associated with abnormal intrahepatic portal branching. The right-sided round ligament joined the first bifurcation of the anterior portal vein without umbilical portion. The defect of hepatic parenchyma on the left lateral segment was considered as a remnant of true umbilical sulcus.
