Figure 15. Coronal MIP image shows unusual accessory arteries that arise from the superior mesenteric artery and aorta and extend in a serpentine pattern along both sides of the aorta (arrows). At surgery, the corkscrew-like arteries were seen to course through the mesocolon and along the gonadal vein. Although great caution was used during surgery, these arteries were extremely fragile and avulsed from the aorta during elevation. Although good hemostasis was achieved by the end of the procedure, the subject developed intraperitoneal hemorrhage a few hours after nephrectomy and underwent emergent exploratory laparotomy to achieve hemostasis.