Evaluation of characteristics of left-sided colorectal perfusion in elderly patients by angiography

Figure 3 Patterns of inferior mesenteric artery bifurcation. A: Illustration of the bifurcation of the inferior mesenteric artery (IMA) [only one sigmoid artery (SA) was showed in the illustration of IMA branches]. Type I: The LCA arose independently from IMA; type II: The LCA and SA arose from the IMA at the same point; type III: The LCA, SA, and SRA were branched from a common trunk from the IMA; and type IV: LCA was lacking; B: Angiography of the bifurcation of the IMA. IMA: Inferior mesenteric artery; SRA: Superior rectal artery; LCA: Left colic artery; SA: Sigmoid artery.