Jpn. J. Vasc. Surg., 13: 13-16, 2004  
 
Fig. 1 Computed tomography showed the retroperitoneal tumor sorrounding the bilateral iliac vessels (A), and a remarkable dilation of right ureter (B). Venography showed total occlusion of the right external iliac (C) and left common iliac veins (D), and poor collaterals in right-side venous drainage.
 
Fig. 2 Operative fidings showed the tumor firmly surrounding the right iliac vessels and ureter (arrow, A). Venous bypass was performed between external iliac vein (A) and inferior vena cava (B) as well as ureterolysis. Pathlogical fidings of the tumor (C) showed chronic inflammatory cell infiltration consisting of plasma cells and lymphocytes along with a proliferation of collagen fibers (hematoxylin eosin stain).
 
Fig. 3 Postoperative venography showed a patent ePTFE graft (A), and a good venous drainage from the left-side iliac veins (B).