Inferior mesenteric arteriovenous fistula: Two case reports

Figure 4 Angiography of the inferior mesenteric artery. A: Nidus of the fistula (black arrows) supplied by the inferior mesenteric artery (black arrowheads); B: Prompt filling of the dilated marginal vein (white arrowheads) with drainage; C: The superior mesenteric vein (white curved arrow) and portal vein (white arrow). Invisible occluded inferior mesenteric vein; D: Nidus (black arrows) observed in the distal portion of the inferior mesenteric artery (white arrows); E: Early visualization of the inferior mesenteric vein (black arrowheads); F: Marginal vein (white arrowheads), with both showing a beaded appearance.