Endometriosis and its complications are a major cause of female infertility. Endometriosis is a dysfunction characterized by the migration of endometrial tissue to areas outside of the endometrium of the uterus. The most common places to find stray tissue are on ovaries and fallopian tubes, followed by other organs in the lower abdominal cavity such as the bladder and intestines. Typically, the endometrial tissue adheres to the exteriors of the organs, and then creates attachments of scar tissue called adhesions that can join adjacent organs together. The endometrial tissue and the adhesions can block a fallopian tube and prevent the meeting of ovum and sperm cells, or otherwise interfere with fertilization, implantation and, rarely, the carrying of the fetus to term.
Endometriosis is estimated to occur in 1% to 5% of women, with an associated risk of infertility for between 30% and 50% of this population.[1][2][3] Endometriosis is commonly classified under the revised American Society for Reproductive Medicine system from minimal endometriosis to severe endometriosis. The therapy and management of endometriosis for infertility is based on the severity of endometriosis.[4]
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