Retroaortic Left Renal Vein with Cascade of Complications in a Neonate.

Background: Retroaortic left renal vein, is a rare congenital anomaly. Case characteristics: A 14-day-old male neonate with retrocrortic left renal vein with posterior nutcracker phenomenon resulting in renal congestion. Observation: He developed septicemia, renal abscess and thrombosis of abdominal aorta. Outcome: Improvement on antibiotics and heparin. Message: Retroaortic left renal vein can cause life threatening complications.