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Medical Definition of Brenner tumour
1. A tumour of the ovary whose structure consists of groups of epithelial cells lying in a fibrous connective tissue stroma. Brenner tumours are uncommon, representing less than 1% of all ovarian neoplasms. Malignant brenner tumours are unilateral. Brenner tumours are ordinarily found incidentally in ovaries removed for other reasons, especially in postmenopausal women. (12 Dec 1998)