In aorto-iliac occlusive disease a diversion of blood flow from visceral arteries to lower limbs rarely occurs. This condition is known as aorto-iliac steal syndrome. This report is about the case of a male patient affected by chronic atherosclerotic occlusion of the aorta associated with an aorto-iliac steal supported by an anomalous vessel coming from the left renal artery to the homolateral external iliac artery to the detriment of the renal blood flow. Renal sequential scintiscan (RSS) at rest and after stress test was employed to assess renal blood flow and excretory functions before and after an aorto-bifemoral bypass. Surgical revascularization permitted reversal of the steal phenomenon and the improvement of left renal blood flow.
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