CT features and common causes of arc of Riolan expansion: an analysis with 64-detector-row computed tomographic angiography.

To study the manifestations of arc of Riolan expansion (ARE) using multi-detector computed tomography angiography (MDCTA).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...