Mesonephric Carcinoma of the Ovary: A Report of Two Cases

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Several types of mesonephric tumors have been described in the female genital tract: adenomas and cystadenofibromas of the rete ovarii, female adnexal tumors of Wolffian origin (FATWOs), and mesonephric carcinomas. FATWOs almost exclusively occur in the upper zone of the Wolffian system, predominantly the broad ligament. Only two cases have been reported in the lower zone, in a paravaginal location. A reversed pattern of incidence seems to be the case for mesonephric carcinomas. Approximately 50 cases have been described in the cervix or vagina but only very few cases in the uterine corpus, including one by our group. There are virtually no previous reports of mesonephric carcinoma of the ovary in the English literature. However, this "missing link" is not in keeping with the presence of mesonephric remnants in the ovarian hilus. Importantly, the issue should not be confused by reports of ovarian mesonephric carcinoma or "mesonephroid tumors" in the older literature. Whilst not disputing that most of these tumors are in fact clear cell carcinomas of Müllerian origin or yolk sac tumors of germ cell origin, it is conceivable that at least some of them are true mesonephric carcinomas.