A staging system has been developed by the America Society of Reproductive Medicine based on the location, depth, size, and amount of endometrial growth
found during laparoscopy.
Menstrual blood flows from the uterus and out of the body through the vagina, but the blood and tissue shed from endometrial growths
has no way of leaving the body.
The most common locations of endometrial growths
are in the abdomen involving the ovaries, fallopian tubes, the ligaments supporting the uterus, the area between the vagina and the rectum, the outer surface of the uterus, and the lining of the pelvic cavity.
Hormonal treatments such as the combined Pill are commonly used to stop endometrial growths
According to Nezhat, laparoscopic bowel resection for endometriosis is performed after a diagnostic laparoscopic examination determines the presence and size of endometrial growths
in the lower colon.