What is endometrioid intraepithelial neoplasia? Endometrioid intraepithelial neoplasia (EIN) is a precancerous condition associated with an abnormally thick endometrium. It is considered a precancerous condition because over time it can turn into a type of endometrial cancer called endometrioid adenocarcinoma. Another name for this condition is atypical endometrial hyperplasia. Is endometrioid intraepithelial neoplasia cancer? No. …
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