A systematic lymphadenectomy can be seen as the golden standard. However, such a radical procedure gives more late morbidity than lymph node sampling. These include the formation of lymphocyst (up to 13.5%), nerve and vessel injury (up to 4%), and increased blood loss and operating time [26, 27]. Studies done for sentinel node in ovarian cancer are very limited and performed in women with uterine cancer by injecting the tracers in the ovary. In case of ovarian cancer such a procedure gives a possible risk of tumour dissemination. In this feasibility study the tracers are injected in the ligaments of the ovary, not in the cortex itself.