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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Marginal artery of the colon

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. Keeping track of the collateral circulations in SMA and IMA is not only beneficial for prognostic evaluation of acute and chronic ischemia, but also for ensuring intestinal blood supply in selection of schemes for colon surgery [ 7 ].

Doppler sonography of the inferior and superior mesenteric arteries in ulcerative colitis. Curr Treat Options Cardiovasc Med. This article has been cited by other articles in PMC.

Arc of Riolan | Radiology Reference Article |

A previous research [ 21 ] suggested that congenital superior-inferior mesenteric arterial variation riolann arc dd Riolan was due to occlusion of proximal superior mesenteric artery. Arteries of the abdomen Large intestine.

Anastomosis of Riolan revisited: The region of interest was positioned at the thoracoabdominal aorta, and the threshold for CT angiography was set as HU. Lumbar branch Iliac branch. Received Nov 28; Accepted Mar 2. Table 1 presents the diameter degree of the fe arc of Riolan on account of following different diseases. Arcuate Vaginal branches Ovarian branches Tubal branches Spiral. Marginal artery of the colon Frontal view of the abdominal aorta and the se supplied by the inferior mesenteric artery.


However, all cases of this study in the control group display full arc of Riolan with CT angiography. It is an inconstant artery that connects the proximal superior mesenteric artery or one of its primary branches to the proximal inferior mesenteric artery or one of its primary branches.

Table 1 Comparison of arc of Riolan diameter following different diseases mm. Portal venous phase acquisition was set 25 sec delay after the previous protocol. Mesenteric artery, abdominalarteries anomalies, MDCT angiography. Introduction The arc of Riolan AORalso known as the central anastomotic riolam 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 ].

The upward group was significantly different from the other two groups.

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 rioan the proximal middle colic artery with a branch of the left colic artery. The diameter degree of arc of Riolan in the upward group, the downward group, and the bi-directional group are showed in Table 2. In case of SMA stenosis, coeliac trunk artery rolan IMA can supply blood via pancreaticoduodenal arc and expanded arc of Riolan to small riooan and right hemicolon.

Embryology, anatomy, and surgical exposure of the great abdominal vessels. Therefore, due to the different positions of mesenterlc artery stenosis, the directions of blood stream in the arc of Riolan are different.

Relevant pathological changes are induced by Escherichia coli infection, leading to intestinal wall hyperaemia, vascular expansion, higher blood flow, and lower vascular resistance. Left colic Marginal Sigmoid Superior rectal. In fact, the intestinal artery blood flow rely mainly on its own pressure difference, may also be affected by the postures, eating, etc besides. Normal anatomical features and variations of bronchial arteries: Loading Stack – 0 images remaining.


As a result, 47 subjects consisted of 27 males and 20 females age range years, mean 50 years were selected into the control group.

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 ve processes in spite of using vasodilator [ 12 ].

A Kolmogorov-Smirnov test was used to assess normal distribution. Previous studies suggest the arc will obviously expand only following obstruction of SMA, but normally, arc of Riolan undergoes little and slow blood flow, and cannot be displayed fully in angiography [ 3 ]. Sonographic and Doppler assessment of the inferior mesenteric artery: The arc of Riolan expanding degree in the upward group is obviously higher than the downward group and the two-way group.

The reasons causing stenosis or obstruction of SMA or IMA include atherosclerosis, mesenteric artery embolism, aorta lesions, and arteritis. Computed tomography angiography of the renal and mesenteric vasculature: When the inferior mesenteric artery cannot fulfill the needs of the tumor growth, the collateral circulation will be activated, supplying blood together by Arc of Riolan rioolan Drummond marginal artery.

DSA is regarded as the golden standard for the evaluation and description of vascular structures.

Conversely, the blood flow direction was defined as downward or bi-directionally depending on body position. Depending on this diameter and the whole imaging profiling, we evaluated the fineness of arc of riolan and make a degree of it.