Borderline ovarian tumors: Guidelines from the French national college of obstetricians and gynecologists (CNGOF)

It is recommended to classify Borderline Ovarian Tumors (BOTs) according to the WHO classification. Transvaginal and suprapubic ultrasonography are recommended for the analysis of an ovarian mass (Grade A). In case of an undetermined ovarian lesion on ultrasonography, it is recommended to perform a pelvic MRI (Grade A) with a score for malignancy (ADNEX MR/O-RADS) (Grade C) included in the report and to formulate a histological hypothesis (Grade C). Pelvic MRI is recommended to characterize a tumor suspected of being BOT (Grade C). It is recommended to evaluate serum levels of HE4 and CA125 and to use the ROMA score for the diagnosis of indeterminate ovarian mass on imaging (grade A). If there is a suspicion of a mucinous BOT on imaging, serum levels of CA 19−9 may be proposed (Grade C). For Early Stages (ES) of BOT, if surgery without risk of tumor rupture is possible, laparoscopy with protected extraction is recommended over laparotomy (Grade C). For treatment of a bilateral serous ES BOT with a strategy to preserve fertility and/or endocrine function, bilateral cystectomy is recommended where possible (Grade B). For mucinous BOTs with a treatment strategy of fertility and/or endocrine function preservation, unilateral salpingo-oophorectomy is recommended (grade C). For mucinous BOTs treated by initial cystectomy, unilateral salpingo-oophorectomy is recommended (grade C). For serous or mucinous ES BOTs, routine hysterectomy is not recommended (Grade C). For ES BOTs, lymphadenectomy is not recommended (Grade C). For ES BOTs, appendectomy is recommended only in case of a macroscopically pathological appendix (Grade C). Restaging surgery is recommended in cases of serous BOTs with micropapillary architecture and an incomplete abdominal cavity inspection during initial surgery (Grade C). Restaging surgery is recommended for mucinous BOTs after initial cystectomy or in cases where the appendix was not examined (Grade C). If restaging surgery is decided for ES BOTs, the following procedures should be performed: peritoneal washing (grade C), omentectomy (grade B), complete exploration of the abdominal cavity with peritoneal biopsies (grade C), visualization of the appendix and appendectomy in case of a pathological macroscopic appearance (grade C) as well as unilateral salpingo-oophorectomy in case of a mucinous BOT initially treated by cystectomy (grade C). In advanced stages (AS) of BOT, it is not recommended to perform a lymphadenectomy as a routine procedur