Table V.

Role of the reproductive tract.

Endometrium and menstruation	Dynamic complex organ that is shed monthly
	Heavier in women with endometriosis Outflow tract obstruction may play a role in pain and endometriosis May differ in women with endometriosis Progesterone resistance or reduction in progesterone action Growth factor differences Nerves or NGF
Uterus	Leiomyomas, adenomyosis associated with similar pain symptoms
	Contractions may differ in women with endometriosis
Ovaries and peritoneal fluid	Dynamic complex events with ovulation
	May differ in women with endometriosis
	Higher levels of hormonal and inflammatory factors
Pregnancy and delivery	Pseudopregnancy resolves lesions
	Cervical diameter may contribute to lesions and symptoms