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A The upper blue arrow points to the renal artery which was located in the middle of the lumbar 1 vertebral body shown by abdominal aortic angiography; the lower blue arrow points to iliac artery bifurcation at the upper edge of the 4 lumbar vertebral body. B The catheter was prophylactically placed in the infrarenal artery, and the two blue arrows point to both ends of the balloon
