Haematoxylin and eosin staining of endometrium (original magnification, 200×).

<p>(A) eutopic endometrium. (B) ectopic endometrium. The glandular tissue (arrow) was obviously observed in eutopic endometrium (A). In ectopic endometrium(B), the neovascularization (arrow) was observed under the columnar epithelial cells (arrowhead).