Mixed Ovarian Tumor Composed of Brenner Tumor and Adult-Type Granulosa Cell Tumor: A Case Report of a Very Rare Mixed Ovarian Tumor and a Review of the Literature

A combination of ovarian tumors with the same histogenetic origin but different histologic subtype is relatively common, whereas a co-occurrence of tumors with different histogenetic origin is rare. We report a case of mixed ovarian tumor composed of Brenner tumor and adult-type granulosa cell tumor, a combination that to the best of our knowledge has not been reported in the literature until now.