Fifty-four-year-old woman presented with recurrent sarcoma in the retroperitoneum. She underwent resection of undifferentiated uterine sarcoma and completed adjuvant chemotherapy a year ago. CT showed an isolated mass invading to the distal duodenum and she had mild symptoms of obstruction (early satiety and nausea). The mass had grown rapidly grown to 20 cm from 6 cm within a short interval of 6 weeks. On CT scan, the mass abutted and displaced the small bowel mesentery without involving the major mesenteric vessels and thus we recommend surgical exploration for possible tumor resection with distal duodenectomy. The tumor was successfully resected enbloc with distal duodenectomy and single segment small bowel resection. The surgical margins were negative for cancer and her post-operative course was uneventful.The video focused on the technical detail of posterior/anterior dissections for complex retroperitoneal tumor.