In Utero and Early-Life
Congenital endometriosis may arise from displaced Müllerian duct epithelium or embryonic rests, with mesenchymal stem cells and progenitor cells potentially involved in pathophysiology.
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This chapter examines how ectopic endometrial foci and congenital endometriosis might originate during fetal life by considering mechanisms of reproductive tract embryogenesis, displaced Müllerian epithelium, and congenital genital anomalies that can be associated with variable teen incidence (reported 11%–40%, higher with outflow obstruction). It highlights uncertainty about which developmental pathways are most relevant, including coelomic metaplasia, embryonic Müllerian rests, persistence of embryonic endometriosis, and the potential role of mesenchymal stem/progenitor cells in establishing endometriosis outside the peritoneal cavity. It also proposes that progenitor cells could contribute to premenarcheal and adolescent endometriosis, potentially seeded by retrograde neonatal uterine bleeding. This paper is centrally about endometriosis — fetal and early-life mechanisms for ectopic endometrial foci and congenital/early-onset endometriosis are discussed, with adenomyosis mentioned only indirectly as part of the developmental context.
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References (50)
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