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. Author manuscript; available in PMC: 2021 Mar 20.
Published in final edited form as: Annu Rev Pathol. 2019 Sep 3;15:71–95. doi: 10.1146/annurev-pathmechdis-012419-032654

Figure 1.

Figure 1

Different types of endometriosis. Endometriosis can occur in several forms: deep infiltrating endometriosis (DIE), ovarian endometriotic cyst (EC), and superficial endometriosis (SE). The insets illustrate the similar histology of (top) eutopic endometrium and (bottom) endometriosis, which is composed of both glandular epithelium and stroma. The small inset illustrates the transdifferentiation of a single circulating progenitor or stem epithelial cell or a group of such progenitor or stem epithelial cells responsible for establishing deep endometriosis. Figure copyright Ie-Ming Shih, Johns Hopkins University.