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In page Ectopic pregnancy:

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Endometriosis is a disease in which cells similar to those of the endometrium, the tissue covering the inside of the uterus, grow outside the uterus. An embryo attaching to such lesions leads to an ectopic pregnancy. Results of a 30 year study of reproductive and pregnancy outcomes, involving 14,000+ women of child-bearing age, were presented at the 2015 European Society of Human Reproduction and Embryology (ESHRE) annual congress.[1] 39% of the study group had surgically confirmed endometriosis. Compared to their peers, the endometriosis subgroup had a 76% higher risk for miscarriage and a 270% higher risk for ectopic pregnancy. The higher endometriosis risks were attributed to increased pelvic inflammation and structural and functional changes in the uterus' lining.[citation needed]