Circumaortic Renal Vein Remodeling Following Abdominal Aortic Aneurysm Repair

A circumaortic renal vein is a congenital vascular anomaly involving an additional renal vein that traverses posterior to the aorta in addition to the normal renal vein traversing anterior to the aorta.1,2 In aortic surgery, it is common to ligate the left renal vein (LRV) to aid in surgical exposure, which is typically inconsequential due to collateral venous channels. We report a case of a circumaortic LRV with the preaortic branch ligated during abdominal aortic aneurysm (AAA) surgery and, as a result, retroaortic LRV hypertrophy was observed during follow-up.