Özet:

Tumours arising from the surface epithelium are the most common tumours of ovaries. They are classified in five major groups including serous, mucinous, endometriod, clear cell and Brenner tumours. These tumours may cause mixed or intermediate lesions. In 30 % of benign Brenner tumours a second surface epithelial tumour is detected in the ipsilateral or contralateral ovary. 43 years old female patient is operated because of a left adnexial mass and she is diagnosed to have Brenner tumourmucinous cystadenoma histopathologically. The case is presented as this type of mixed ovarian tumour is not so common with an incidence of 30 % and the case has typical microscopic and macroscopic features.

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