Inclusion Criteria:  Patients with a diagnosis of adnexal mass with high suspicion of malignancy and frozen section examination will undergo the lymphatic map with a radiotracer. Patients with intraoperative diagnosis of epithelial ovarian cancer will undergo the SLN exeresis with two tracers. Patients with a delayed diagnosis of epithelial ovarian cancer who are candidates to undergo a re-staging surgery will undergo the SLN exeresis with two tracers.  Exclusion Criteria:  Advanced ovarian cancer (FIGO III/IV) Patients <18 years Pregnancy or lactation Previous vascular surgery (cava, aorta, iliac vessels), lymphadenectomy (pelvic or paraortic) or radiotherapy (pelvic or paraortic field) Severe adherent syndrome that prevents tracer injection The SLN technique will not be performed in case of benign ovarian tumor in the frozen section or borderline tumor (since in these cases there is no clinical indication of performing a lymphadenectomy) Non-operable patient Previous adverse events to the radiotracer or ICG