Robot-assisted retroperitoneal laparoscopic excision of perirenal vascular tumor: A case report

Figure 1 Preoperative angiography of the double renal artery. A: Cystic low-density shadow in the left renal hilus with a lacy edge; B: Mass adjacent to the abdominal aorta, wrapping the left side, compressing the surrounding tissue, the upper segment of the left ureter, and dilated hydronephrosis in the left kidney.