Ventral Portal Vein Over Gallbladder and Pancreas---An Exceptional Anatomical Variation Found in a Liver Transplant Patient: A Case Report.

BACKGROUND: Anatomic variations are well known in the liver hilum. A rare precholecystic, preduodenal, prepancreatic portal vein is described as found in a liver transplant candidate. Precholecystic location of portal vein is an exceptional finding and does not seem to have been previously described. It is associated with a preduodenal portal vein. Its position is challenging, as its surface can be mistaken with the gallbladder wall. We present the case of a patient candidate to liver transplantation. In the preoperative studies, a portal thrombosis was suspected, with recanalization by collaterals, but also a malformation was suggested. The patient had a primary biliary cirrhosis. Other findings included agenesis of inferior vena cava on the right side. During operation, the portal vein was found over the gallbladder and fixed to it, making it at first difficult to distinguish one from the other. CONCLUSIONS: A precholecystic portal vein is a rare finding that poses a challenge for the surgeon. It must be ruled out in the preoperative workout.