The actual location of the endometrial implants in the body depends on the way in which they were transported to their new site. Because the majority of implants are transported to their new location by retrograde menstruation, almost all endometrial implants are found in the pelvic cavity. As blood and lymph transportation of endometrial fragments is rare, it is unusual to find implants in other parts of the body.
The ovaries are one of the most common sites for endometriosis and at least 50% of women with endometriosis have some implants on one or both of their ovaries. The other most common sites are the utero-sacral ligaments, the Pouch of Douglas and the peritoneum.
On rare occasions, endometriosis has been found in almost every part of the body including surgical and episiotomy scars, the cervix, vagina, diaphragm, navel, lungs, breasts, arms and legs, the groin and the nose.
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