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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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Thank you for updating your details. In case of severe blood supply deficiency in SMA, arc of Riolan becomes the major collateral vessel.

CT value of mesenteric artery greater HU was considered as an appropriate and evaluable imaging. The expansion of arc of Riolan was the most significant following obstruction of SMA. The arc of Riolan AORalso known as the central anastomotic mesenteric artery or meandering mesenteric artery, is an arcase artery which links the proximal superior mesenteric artery SMA or one of its principal branches to the proximal inferior mesenteric artery IMA or one of rioln primary branches [ 1 ].

Unable to process the form. A previous research [ 21 ] suggested that congenital superior-inferior mesenteric arterial variation or arc of Rilan was due to occlusion of proximal superior mesenteric artery. The data in this group indicates that the presence of arc of Riolan is closely related to not only the severe obstruction of SMA, but also obstruction of IMA, severe stenosis of SMA not obstruction also cause the expanded arc of Riolan.

Finally, after informed consent was obtained, subjects age range between years; the mean value, 51 years were examined, including males and females MDCTA shows that arc of Riolan expansion occurred in 47 cases consisted of 29 males and 18 females age range, years; mean 53 years.

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Statistical processing For continuous data, average diameter and range min-max values were used for descriptive statistics, respectively. The 5 active UC patients all displayed intestinal vessel expansion, marginal artery expansion and arc of Riolan thickening, and strengthened intestinal wall, which are similar with Doppler ultrasound researches [ 17 – 19 ], namely UC can induce higher IMA blood flow, faster blood flow, and larger inner diameter in blood vessels.

For continuous data, average diameter and range min-max values were used for descriptive statistics, respectively.

The region of interest was positioned at the thoracoabdominal aorta, and the threshold for CT angiography was set as HU. DSA angiogram – Arc of Riolan. We retrospectively analyzed patients clinically suspected as aorta or abdominal intestinal lesions and received CTA in aorta abdominal or mesenteric artery between June and June Arcare information regarding vascular, bowel and their relations with one another can be obtained, hence, CTA compared with DSA shows the equal or very similar diagnostic value [ 1314 ].

Marginal artery of the colon

Table aecade Comparison of arc of Riolan diameter between the upward group, the bi-directional group, and the downward group mm. Articles Cases Courses Quiz. Introduction The arc of Riolan AORalso known as the central anastomotic mesenteric artery or meandering mesenteric artery, is an inconstant artery which links the proximal superior mesenteric artery SMA or one of its principal branches to the proximal inferior mesenteric artery IMA or one of its primary branches [ 1 ].

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Therefore, the observed of obstruction or severe stenosis of SMA were divided into upward group; the cases suffered from obstruction or severe stenosis of IMA, sigmoid colon cancer and active ulcerative colitis were grouped in downward or bi-directionally. Thus limitations are inevitably showed in this study. This page was last edited on 30 Novemberat 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.

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Statistical analysis was done with the Statistical Package for the Social Sciences version Retrieved from ” https: Further research is needed to reveal the arc of Riolan expansion induced by obstruction of the different segments in SMA and course of the disease.

However, all cases of this study in the control group display full arc of Riolan with CT angiography.

Arc of Riolan | Radiology Reference Article |

Inferior pancreaticoduodenal Intestinal arcde ileal arcades vasa recta Ileocolic colic anterior cecal posterior cecal ileal branch appendicular Right colic Middle colic Marginal. The manifestations and clinical data of consecutive mesentery CTA images were retrospectively analyzed.

Staging of T3 and T4 gastric carcinoma with multidetector CT: Frontal view of the abdominal aorta and the territory supplied by the inferior mesenteric artery. P values less than 0. Second, celiac and mesenteric artery variation situation did not be considered in our paper.

Marginal artery of the colon – Wikipedia

Assessment of aortic pathology and peripheral arterial disease using multidetector computed tomographic angiography. In conclusion, MDCTA clearly display the full view and profile of arc of Riolan expansion and blood stream compensation.

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.