Female adnexal tumor of probable Wolffian origin arising from mesosalpinx: A case report and review

: Female adnexal tumors of probable Wolffian origin (FATWO) are a rare neoplasm from the mesonephric duct remnants with less than 90 cases having been reported worldwide. A 34-year-old nulliparous woman was referred to our clinic for a recent discovery of a pelvic mass, the diagnosis of FATWO has been confirmed based on the pathological and immunohistochemical results.