Potential histological discordance revealed by second review in the national rare gynecological cancer network (TMRG)

•Systematic review of rare ovarian tumors identify minor and major histological discrepancies in all categories of ovarian tumors.•Systematic review of rare ovarian tumors has a direct implication in the management of patients.•Most of the major discrepancies relate to mucinous tumors, in evaluation of the degree of malignancy or in the distinction with a digestive metastasis.•The major discrepancies relating to sex cord tumors tumors mainly concern granulosa cell tumors in the distinction with fibroma or sertoli-leydig cell tumors.