Вариантная анатомия бассейна нижней брыжеечной вены

Abstract

Aim of study. The inferior mesenteric vein has three variants of the ostium. Each variant of the inferior mesenteric vein ostium has its morphological peculiarities. According to literatures, the occurrence is different between the variants of the confluence. The aim of this study was to determine the morphometric characteristics of veins forming different variants of the inferior mesenteric vein ostium and the occurrence of the two formation types of this vein (the magistral one and the transitional one). Material and methods. Vessels (inferior mesenteric veins) of 53 male patients undergoing treatment in surgery departments of the Krasnoyarsk Regional Clinical Hospital No.1 were enhanced with contrasting agents, studied and analysed. The work was performed using 3D-models of the vascular bed of the portal system (GE Advantage Workstations, Siemens singo.via) based on MSCT of the abdominal cavity with bolus contrast enhancement using the Ultravist-370 agent. We applied an original method for manufacturing of corrosion preparations of vessels (RF Patent for an invention “method of manufacturing models of human rectal veins” No.2545921 dated 26.02.15) and studied morphological parameters using 85 vein models of the colon, the sigmoid colon and the rectum. Results. The occurrence rates are different for the variants of the inferior mesenteric vein confluence (serving as the root for the portal vein in 5.5%, as the tributary of the splenic vein in 17.5% and draining into the superior mesenteric vein in 77% of the cases). The length of the inferior mesenteric vein differs for its confluence variants and varies from 54.5mm to 108.5mm; the diameter varies from 4.0 to 7.2mm. The magistral formation type of the inferior mesenteric vein is revealed in 23% of the cases and is characteristic to its drainage into the splenic vein or to its immediate junction with the portal artery trunk. In 77% of the cases, its formation type is transitional. Conclusion. The knowledge on ostium formation variants of the inferior mesenteric vein, inflow of its roots, characteristics of branches of the studied vessel is necessary for surgeons performing operations on the upper part of the abdominal cavity and for radiologists interpreting the images obtained at the stage before the operative intervention