The topographo-anatomical conditions of reconstruction of the trunk and roots of the portal vein during gastropancreatoduodenal resection

Abstract

Topographic and anatomical variants of vascular plastics in extended gastropancreatoduodenal resection are substantiated. The anatomical study was performed on 30 organ complexes and 5 not embalmed human corpses. Significant variability of the roots and tributaries of the v. portae and their location near the pancreas was revealed. The extended contact of the mesenteric-portal segment with the head of the pancreas promotes the involvement of the veins of the portal system in the tumor process. The magistral type of the structure of the superior mesenteric vein was revealed in 19 cases, the distributed type in 11, which determines the conditions for vascular reconstruction. In the experiment the possibility of creation the formation of the direct mesenteric-portal anastomosis after duodenectomy was established in case of shifting the mobilized root of the mesentery of the small intestine in the direction of the liver gate. If splenic vein resection is necessary, adequate blood outflow from the stomach, spleen, and pancreatic stump can be provided by forming a distal splenic-renal anastomosis or, with a sufficient length of the splenic vein, a splenic-portal anastomosis. Based on computed tomography angiographs and intraoperative data 29 patients underwent extended gastropancreatoduodenal resection followed by vascular reconstruction. Tumor invasion of the trunk of the portal vein on computed tomography angiograms was represented by offset and the contact of the tumor with portal vein for over 10 mm (in 7 cases), the displacement and deformation of the portal vein tumor (in 5 cases), tumor infiltration of more than 50% of the circumference of the portal vein (in 3 cases). Extended contact with the tumor was identified in 9 cases, confluence stenosis of the portal vein — in 5 cases. The tumor invasion into the portal vein, and the vascular system was restored by the formation of a port-portal anastomosis in 15 cases. Moreover at the reconstruction of mesenteric-portal segment we formed mesenteric-portal anastomosis in 10 cases. Also in 2 cases mesenteric-portal anastomosis in the confluence area of the iliac colon and jejunum tributaries was formed, in 1 case we formed anastomosis between the ileum-colon vein and the portal vein (with 1:2 diameter difference without patency disorders). In one single case we connected iliac colon vein wall with jejunum vein wall and formed anastomosis between them and portal vein. Distal splenorenal anastomosis was formed in 10 patients from this group. Spleno-portal anastomosis was formed in 3 patients above the junction of the portal and superior mesenteric veins.

Keywords

anastomosis / mesenteric vein / portal vein / gastropancreatoduodenal resection / tumor invasion / borderline resectability / pancreatic ductal adenocarcinoma / vessel resection

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RIGHTS & PERMISSIONS

Dzidzava I.I., Gayvoronsky I.V., Kotiv A.B., Alentyev S.A.