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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Disclosure of conflict of interest None. Different from the angiograph, MDCTA belongs to antegrade physiological imaging, and the developing time interval is very close between SMA and IMA, really reflecting the characteristics of anatomy and blood stream in these vessels. Statistical analysis was done with the Statistical Package for the Social Sciences version In addition to the axial source data, post-processed multiplanar-reconstruction MPRmaximum-intensity projection MIPand 3D volume-rendering VR images were evaluated by two radiologists with 4 and 6 years of experience in CT angiographic imagingand the decisions were made in consensus.

In this study, the retrospectively analysis was performed by studying a large amount of patients who have abdominal large-vascular lesion or intestinal disease with treatment of the detector-row spiral CTA in the recent 5 years and finally we summarize the manifestations of the arc of Riolan expansion.

Doppler sonography of the inferior and superior mesenteric arteries in ulcerative colitis. Table 1 Comparison of arc of Riolan diameter following different diseases mm. Received Nov 28; Accepted Mar 2.

Charts were also reviewed for documented evidence that information provided by the CT angiogram affected ultimate patient care, either by influencing the decision to perform surgery or endovascular interventional treatment.

Open in a separate window. Third, we assume that the arc blood flow direction is based on the difference of vascular lumen diameter is raised, not confirmed by doppler. A Kolmogorov-Smirnov test was used to assess normal distribution.


Absence of the superior mesenteric artery in an adult and a new classification method for superior-inferior mesenteric arterial variations. It forms a short loop riolab runs close to the root of the mesentery. Combined with CTA imaging, it can differentiate the formation of the arc, which is very useful for selection of operational scheme.

Along with branches of the internal iliac arteriesalso known as Cherbanyk’s arteries, it is usually sufficiently large to supply the oxygenated blood to the large intestine covered by the inferior mesenteric artery and is a reason that in abdominal aortic aneurysm repair the inferior mesenteric artery does not have to be re-implanted re-attached into the repaired abdominal aorta.

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 ].

In case of severe blood supply deficiency in SMA, arc of Riolan becomes the major agcade vessel.

Marginal artery of the colon – Wikipedia

Three patients were excluded because the concentration of contrast collected at arterial phase was not high enough. Male, year-old, VR image shows IMAobstruction, proximal segment not displayed, compensated via Riolan white arrowhead.

When present, the arc of Riolan is an riklan connection between the SMA and IMA in the setting of arterial occlusion or significant stenosis. The region of interest was positioned at the thoracoabdominal aorta, and the threshold for CT angiography was set as HU.

The diameter degree of arc of Riolan in the upward group, the downward group, and the bi-directional group are showed in Table 2. Second, celiac and mesenteric artery variation situation did not be considered in our paper. Computed tomography angiography of the renal and mesenteric vasculature: All factors affecting artery load will contribute to changes in mesenteric artery blood flow including position and foods [ 20 ].


Staging of T3 and T4 gastric carcinoma with multidetector CT: ARE often suggests the occurrence of obstructed intestinal feeding artery or intestinal lesions.

CT findings such as bowel wall thickening, contrast enhancement, intestinal obstruction, marginal artery expansion, lymph node enlargement varied and were help to identify the cause of ARE.

Marginal artery of the colon

From Wikipedia, the free encyclopedia. Relevant pathological changes are df by Escherichia coli infection, leading to intestinal wall hyperaemia, vascular expansion, higher blood flow, and lower vascular resistance. Color Duplex evaluation of the mesenteric artery. Therefore, in our study, CT examination schemes adopt supine and scan on an empty stomach, and assumed that arc of Riolan blood flow was only decided by the arterial pressure difference.

The 7 cases of IMA obstruction in this group included 6 cases of aorta interlining false lumen and abdomen aorta tumor, forming thrombus complicated with IMA obstruction, and 1 case with history of multiple aorta arteritis.

Arc of Riolan | Radiology Reference Article |

P values less than 0. Support Center Support Center.

Mesenteric artery, abdominalarteries anomalies, MDCT angiography. Inferior epigastric Corona mortis Deep circumflex iliac Femoral see arteries of lower limbs.

A VR image shows SMA obstruction long arrowheadshort arrowhead indicates arc of Riolan expansion; b arterial phase axial view, indicating arc of Riolan section white arrowslight oedema and ileus in intestinal wall dovetail arrow. By using this site, you agree to the Terms of Use and Privacy Policy. Radiol Clin North Am. 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.