When present, the arc of Riolan is an important connection between the SMA and IMA in the setting of arterial occlusion or significant stenosis. In proximal SMA. embryologic development of the mesenteric structures and their blood . collaterals include the arch of Bühler and gastroduodenal arcade. SMA to inferior mesenteric artery (IMA) collaterals include the arc of Riolan and the marginal artery of. The marginal artery of Drummond is the major collateral arcade between the SMA and IMA, is Differentiation of the Arc of Riolan from the Marginal artery of.

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MDCTA can clearly display the situation of arc of Riolan and collateral circulation, and together with Rioolan symptoms, can guide the selection of diagnosis and treatment schemes in clinic.

Nevertheless, some variations can be overlooked when this technology is used in cases where description of the collateral circulation system between SMA and IMA is difficult, where the catheter tip is far from where it should be in the SMA or IMA during selective angiographic processes in riolwn of using vasodilator [ 12 ].

Considering the invasion and complications of DSA, many researches focus on the application of CT angiography on the studying of vascular structures in many diseases [ 4 – 6 ]. Box figure shows the diameter of arc of Riolan on account of following different diseases.

It made the connection between the middle colic branch of the SMA and the left colic branch of the IMA and can form a short loop that runs close to the root of the mesentery. Discussion Arc of Riolan, named by Jean Riolan, an anatomist from France, is a crucial connection between the SMA and IMA in the setting of arterial occlusion or significant stenosis besides Drummond marginal artery, which located in mesocolon, striking along the medial margins [ 3 ].


Axial source data, MPR, MIP and VR images were independently and blindly evaluated by two radiologists with 3 and 5 years of experience in CT angiographic imagingand the decisions were made in consensus.

Articles Cases Courses Quiz. Third, we assume that the arc blood flow direction is based on the difference of vascular lumen diameter is raised, not confirmed by doppler. Two radiologists after reaching consensus analyzed the shapes of mesenteric artery, CT findings and the occurrence and causes of ARE.

The reasons causing stenosis or obstruction of SMA or IMA include atherosclerosis, mesenteric artery embolism, aorta lesions, and arteritis. Large-scale cases were examined. Conversely, bowel wall thickening, contrast enhancement, intestinal obstruction ,marginal artery expansion, lymph node enlargement were not seen in most IMA obstruction, whereas showed commonly in advanced sigmoid colon cancer and active UC respectively, with no difference between the two groups.

However, all cases of this study in the control group display full arc of Riolan with CT angiography. Retrieved from ” https: In case of SMA stenosis, coeliac trunk artery and IMA can supply blood via pancreaticoduodenal arc and expanded arc of Riolan to small intestine and right hemicolon. Female, year-old, ulcerative colitis at active phase, coronal slap-MIP AVR B at arterial phase, white arrowhead indicates expanded arc of Riolan, red arrowhead indicates suffused intestinal wall thickening, obvious strengthening.

Five patients were excluded from CTA because of severe contrast-agent contraindications, such as history of adverse reactions 1 case and renal inadequacy 4 cases.

Marginal artery of the colon

Together with axial images, 3D images provide a very good anatomical orientation. Arcuate Vaginal branches Ovarian branches Tubal branches Spiral. In this study, all of the eight observed colon cancer cases with Riolan expansion were the advance of the sigmoid colon carcinoma infiltrating including sigmoid colon and partial descending colon.

The major clinical manifestations include: Proper hepatic cystic Right gastric Gastroduodenal right gastroepiploic superior pancreaticoduodenal supraduodenal. Wikipedia articles with TA98 identifiers. A previous research [ 21 ] suggested that congenital superior-inferior mesenteric arterial variation or arc of Riolan was due to occlusion of proximal superior mesenteric artery.


Thus limitations are inevitably showed in this study. Comparison of arc of Riolan diameter between the upward group, the bi-directional group, and the downward group mm.

By using this site, you agree to the Terms of Use and Privacy Policy. The Arc of Riolan Riolan’s arcade, Arch of Riolan, Haller’s anastomosisalso known as the meandering mesenteric arteryis another vascular arcade present in the colonic mesentery that connect the proximal middle colic artery with a branch of the left colic artery. The region of interest was positioned at the thoracoabdominal aorta, and the threshold for CT angiography was set as HU.

Marginal artery of the colon – Wikipedia

Superior vesical artery Umbilical artery Medial umbilical ligament to ductus deferens. Pancreatic branches greater dorsal Short gastrics Left gastroepiploic.

Related Radiopaedia articles Anatomy: Dolichoectasia of the intracranial arteries. In the control group, only This artery is found low in the mesentery, near the root.

Author information Article notes Copyright and License information Disclaimer. Curr Treat Options Cardiovasc Med. CT value of mesenteric artery greater HU was considered as an appropriate and evaluable imaging. Views Read Edit View history. Therefore, due to the different positions of mesenterlc artery stenosis, the directions of blood stream in the racade of Riolan are different. Both its actual existence and the general need for terms other than those mentioned in Terminologia Anatomica have been questioned by surgeons 2.

MDCTA belongs to antegrade image, and ce blood flow direction can be determined by the position of stenosis and the size variation of blood vessels.