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WHO Classification of Tumours
Mixed epithelial tumor (borderline)
Ovary


Definition

A low grade ovarian epithelial tumor composed of a mixture of two or more of the five major cell types: serous, mucinous, endometrioid, clear cell, and Brenner/transitional. Histologically, it typically shows papillae with detached cell clusters. Microinvasion may be seen rarely.
The majority of patients present with stage I tumor, a minority with bilateral disease

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Tavassoli FA, Devilee P (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Tumours of the Breast and Female Genital Organs.
3rd Edition
IARC Press: Lyon 2003



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