Fig. 6

a Axial T2 MRI of the abdomen at the level of the common iliac vessels, showing bilateral common iliac veins (white arrows). The left common iliac artery is present (black arrow). However, the right is absent. b, c and d More inferior axial T2 images at the level of the external iliac vessels showing the right external iliac vein (white thin arrow), without an accompanying artery. The left external iliac artery (black arrow), gives rise to a large vessel (thick white arrow) that crosses to the right side and passes superficially just posterior to the anterior abdominal wall, anterior the insertion of the distal ureters. This artery then continued as the right common femoral artery. The internal iliac vessels were absent bilaterally