 About 20 of ovarian cancer patients stage III-IV, however, are not operable at the time of diagnosis because of the spread of the disease. In these cases, the gold standard treatment consists of submitting the patient to Interval Debulking Surgery IDS after neoadjuvant chemotherapy. The prognosis of these patients compared to those who are subjected to primary surgery, with the same residual tumor after surgery, is currently a topic of controversial debate. Recently, a multicenter, randomized EORTC showed no difference in prognosis between primary surgery and Interval Debulking Surgery in a population stratified by residual tumor. There are few retrospective studies that consider the presence of lymph node metastases in patients undergoing Interval Debulking Surgery: the percentage of lymph node metastases in this subset varies from 37.5 to 75. 