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A case of malignant Brenner tumor (MBT) in a 42-year-old woman is described. According to the literature it is evident how rare this type of MBT is as well as the histogenetic problems arising in this neoplasia deriving from the coelomic epithelium. The malignant histologic criteria are those adopted in 1973 by Hull and Combell who showed as unquestionable signs the association of benign and malignant Brenner tumor, the invasion of the stroma on behalf of the malignant Brenner elements and the absence of mucinous cystadenoma or the association with the above mentioned.

The Authors, after a short review on the histopathological, histogenetic and prognostic aspects, report a clinical case observed by them, in a pregnant woman. They emphasize the asymptomatic obstetric course and the accidental discovery during surgical treatment.

Neoplastic associations of Brenner tumor. About a case associated with the adenocarcinoma of the sigma. An unusual association of a Brenner tumor and an adenocarcinoma of the sigma is reported. A thorough review of the literature on the associations of Brenner tumor with other neoplasms is presented. In most cases Brenner tumor was associated with other ovarian tumors sharing, therefore, a common origin from the caelomic epithelium and all oestrogen dependent. Only rarely have associations with other tumors akin to the present been reported.

The A. expose three cases of ovarian tumors: the first of a malignant teratoma with metastasis inside abdominal wall, the second of Brenner's tumor, the third of an estrogen-producing ovarian hypernefroma.