Yonsei Med J.  2013 Nov;54(6):1484-1490. 10.3349/ymj.2013.54.6.1484.

The Relation between Inferior Mesenteric Vein Ligation and Collateral Vessels to Splenic Flexure: Anatomical Landmarks, Technical Precautions and Clinical Significance

• Al-Asari S
• Lim D
• Min BS
• Kim NK

• KMID: 1798147
• DOI: http://doi.org/10.3349/ymj.2013.54.6.1484

Abstract

PURPOSE
Our aim to assess clinical significance of the relation between inferior mesenteric vein ligation and collateral blood supply (meandering mesenteric artery) to the splenic flexure with elaboration more in anatomical landmarks and technical tips.
MATERIALS AND METHODS
We review the literature regarding the significance of the collateral vessels around inferior mesenteric vein (IMV) root and provide our prospective operative findings, anatomical landmarks and technical tips. We analyzed the incidence and pattern of anatomic variation of collateral vessels around the IMV.
RESULTS
A total of 30 consecutive patients have been prospectively observed in a period between June 25-2012 and September 7-2012. Nineteen males and eleven females with mean age of 63 years. Major colorectal procedures were included. There were three anatomical types proposed, based on the relation between IMV and the collateral vessel. Type A and B in which either the collateral vessel crosses or runs close to the IMV with incidence of 43.3% and 13.3%, respectively, whereas type C is present in 43.3%. There was no definitive relation between the artery and vein. No intra or postoperative ischemic events were reported.
CONCLUSION
During IMV ligation, inadvertent ligation of Arc of Riolan or meandering mesenteric artery around the IMV root "in type A&B" might result in compromised blood supply to the left colon, congestion, ischemia and different level of colitis or anastomotic dehiscence. Therefore, careful dissection and skeletonization at the IMV root "before ligation if necessary" is mandatory to preserve the collateral vessel for the watershed area and to avoid further injury.

Keyword

Inferior mesenteric vein; collateral; arc of Riolan; meandering artery

MeSH Terms

Duodenum/anatomy & histology
Female
Humans
Ligation/*methods
Male
Mesenteric Veins/*surgery
Middle Aged
Pancreas/anatomy & histology
Prospective Studies

Figure

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  Fig. 1 Inferior mesenteric vein variations, 1) Drain at the confluence, 2) Drain at superior mesenteric vein, 3) Drain into splenic vein. PV, portal vein; SV, splenic vein; SMV, superior mesenteric vein; IMV, inferior mesenteric vein.

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  Fig. 2 Open view; type A class, 1) Collateral vessel crosses the inferior mesenteric vein at the lower of the pancreas, 2) IMV cut end, 3) Lower border of the pancreas, 4) Duodenum, 5) Aorta, 6) Cut end of the inferior mesenteric artery, 7) Left colic. IMV, inferior mesenteric vein.

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  Fig. 3 (A) Open view; type B; 1) Inferior mesenteric vein, 2) Arc of Riolan, 3) Dissection of starting point separates the artery from the vein, 4) Duodenum, 5) Pancreas. (B) laparoscopic view; type B; 1) Collateral artery (Arc of Riolan), 2) Inferior mesenteric vein, 3) Duodenum. (C) Laparoscopic view; type B; 1) Collateral artery (Arc of Riolan), 2) Inferior mesenteric vein, 3) Duodenum.

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  Fig. 4 Laparoscopic view; type C, 1) inferior mesenteric vein (IMV), 2) Duodenum, 3) Ligament of Treitz, 4) Pancreas. No arterial relation to IMV.

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  Fig. 5 The percentage of each type of collateral vessels in relation to inferior mesenteric vein.

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  Fig. 6 Laparoscopic view demonstrates the critical zone of inferior mesenteric vein (IMV), showing that the arc of Riolan crosses the IMV at the lower border of the pancreas to the right side. Ligation of the IMV should be below the arc of Riolan.

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  Fig. 7 (A) Robotic view of inferior mesenteric artery; R) Arc of Riolan, L) Left colic artery, S) Sigmoid artery, A) Aorta. (B) Robotic florescent view; R) Arc of Riolan, L) Left colic, S) Sigmoid artery.

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