From:
http://www.endometriosis.org.au/imag...ometriosis.pdf

Infertility
Infertility is present in about 30 per cent of women with endometriosis. It is believed that chemicals may be released from the endometriosis cells that:
? Interfere with the ability to conceive or
? Affect early normal development of the embryo

In moderate to severe cases, scarring may cause interference with the release of the egg (ovulation) and passage of the egg along the tube because of damage or blockage.