Aorto-left renal vein fistula is a rare complication of abdominal aortic aneurysm with unique clinical presentation

Spontaneous aorto-left renal vein fistulas (ALRVF) are extremely rare, with only 30 cases presented in the literature. In the majority of the reported cases, the fistula involved an anomalous retroaortic left renal vein. In some aspects, the clinical findings differ from those of aortocaval fistulas, often making the correct diagnosis difficult and contributing to the delay in treatment. In this article, we present 2 such cases, review previously reported data, and discuss clinical features and treatment options of this rare condition.