 In the literature there is only one prospective randomized study on lymphadenectomy in advanced ovarian cancer without node lesions macroscopically observed bulky nodes during the first surgery. The authors reported a significant benefit in terms of disease free survival DFS, but not in terms of overall survival OS in patients who underwent systematic lymphadenectomy and who had a residual tumor 1 cm. Patients with intra-abdominal residual tumor 1 cm could theoretically not benefit from a systematic lymphadenectomy since most of lymph node metastases undetectable to intraoperative assessment are smaller than 1 cm. 