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. Author manuscript; available in PMC: 2013 Oct 19.
Published in final edited form as: Obstet Gynecol. 2012 Nov;120(5):1160–1175. doi: 10.1097/aog.0b013e31826bb121

Table 3.

Functional, diagnostic, and therapeutic aspects of the endometrial intraepithelial neoplasia (EIN) classification

EIN Nomenclature Topography Functional Category Treatment
Benign architectural changes of unopposed oestrogens (endometrial hyperoplasia) Diffuse Oestrogen effect Hormonal treatment
EIN Focal, later diffuse Precancer Hormonal or surgical
Carcinoma Focal, later diffuse Cancer Surgical, stage based

Reproduced from Baak JP, Mutter GL. EIN and WHO94. J Clin Pathol 2005;58(1):1–6. Copyright ©2005 BMJ Publishing Group Ltd. with permission from BMJ Publishing Group Ltd.