Background and Objectives In the Robot Assisted Surgery for High Risk Endometrial Cancer (RASHEC) trial, patients with high-risk endometrial cancer were randomly assigned to robot-assisted laparoscopic surgery (RALS) or laparotomy for pelvic and infrarenal para-aortic lymph node dissection. We here report on self-reported lower limb lymphedema (LLL), lymphocyst formation, ascites, and long-term serious adverse events 12 months after surgery. Patients and methods Patients were enrolled between 2013 and 2016, and 96 patients were included in the per protocol analysis, evenly distributed between RALS and laparotomy. Self-reported LLL was recorded using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire for endometrial cancerEN24, assessed before and 12 months after surgery. Computed tomography was assessed at baseline, 3, and 12 months. Medical charts were reviewed for serious adverse events and hospital admissions 31 to 365 days after surgery. Results At 12 months after laparotomy and RALS, 61% and 50% patients, respectively, reported LLL (p = 0.31). In univariate analysis, the mean score of LLL at 12 months was significantly higher for laparotomy than for RALS (p amp;lt; 0.05) and for those without abdominal drainage (p = 0.02), but was not independently associated with LLL in the multivariate analysis. Imaging showed no significant difference in lymphocyst formation or ascites between surgical modalities. No difference was found in serious adverse events and admissions to hospital for any reason. There was no agreement between lymphocyst formation or ascites and self-reported LLL. Conclusion Follow-up 1 year after comprehensive surgical staging for high-risk endometrial cancer showed no differences in self-reported LLL, findings on imaging, or SAE between laparotomy and robot-assisted surgery.