Fig. 3

Preoperative 3D-CT scan of vessels shows dilated veins in the inferior mesenteric area and the Retzius vein crossing the abdominal aorta and IMA to the IVC. a Frontal view. b Lateral view (hand-drawn picture). IMA inferior mesenteric artery, IMV inferior mesenteric vein, IVC inferior vena cava, LCA left colic artery, SRA superior rectal artery, Ao abdominal aorta