[Operative management of retroperitoneal tumors involving major blood vessels: a report of 20 cases].

We report the experience of operative management in 20 patients with retroperitoneal tumors with major adjacent blood vessels involved, including portal vein inferior vena cava, abdominal aorta, iliac and renal vessels, and superior mesenteric vein. The diagnosis, preoperative preparation, intraoperative management and the postoperative complications were discussed. We emphasize the importance of radical resection of the tumors involving major blood vessels and vascular reconstruction.