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2015 ; 8
(3
): 3193-201
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CT features and common causes of arc of Riolan expansion: an analysis with
64-detector-row computed tomographic angiography
#MMPMID26064208
Xie Y
; Jin C
; Zhang S
; Wang X
; Jiang Y
Int J Clin Exp Med
2015[]; 8
(3
): 3193-201
PMID26064208
show ga
OBJECTIVE: To study the manifestations of arc of Riolan expansion (ARE) using
multi-detector computed tomography angiography (MDCTA). MATERIALS AND METHODS:
The manifestations and clinical data of 626 consecutive mesentery CTA images were
retrospectively analyzed. The 47 cases with ARE and 47 patients without expansion
were involved. The average diameter of arc of Riolan was measured. Two
radiologists after reaching consensus analyzed the shapes of mesenteric artery,
CT findings and the occurrence and causes of ARE. RESULTS: The mean diameter of
arc of Riolan was 1.2 mm, 4.6 mm, 2.5 mm, 2.3 mm, 1.9 mm, 2.5 mm, and 2.0 mm at
baseline and following obstruction of superior mesenteric artery (SMA), stenosis
of SMA, obstruction of inferior mesenteric artery (IMA), stenosis of IMA, colon
cancer, and active ulcerative colitis, respectively. The expansion of arc of
Riolan was the most significant following obstruction of SMA. The diameters of
arc of Riolan were significantly different between the upward flow group and the
downward or the two-way flow groups, and between the colon tumor group and the
active ulcerative colitis group. 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. CONCLUSIONS:
ARE often suggests the occurrence of obstructed intestinal feeding artery or
intestinal lesions. MDCTA can clearly display the situation of arc of Riolan and
collateral circulation, and together with CT symptoms, can guide the selection of
diagnosis and treatment schemes in clinic.