Endoscopic image of a ruptured chocolate cyst in left ovary. Endometrial tissue is the mucous membrane that normally lines the uterus. The endometrium is richly supplied with blood and its growth is regulated by estrogen and progesterone. It consists of glandular and stroma tissue from the lining of the uterus. When the endometrial mucous membrane is found outside of the uterus in places such as the ovaries, it causes chronic pelvic pain with intercourse and menstrual cycles.<unk> s can produce a toxic environment by producing estrogen, cytokines, interleukins, and other inflammatory substances, that could damage healthy<unk> l tissue. This toxic fluid content can cause dire alterations to the normal surrounding endometriotic cells, potentially impacting the embryo, the ability of an embryo to implant successfully, and the responsiveness of the endometrium.<unk>  can potentially lead to premature ovarian failure, decreased ovarian function, or problems with ovulation. Studies have also found that<unk> s occur two times more frequently in the left ovary (67%) than in the right one (33%), possibly due to the presence of the sigmoid colon on the left side.
Endometrioma
Endometrioid tumor
Pelvic lipomatosis
Endometriosis
Endometrial stromal tumour
Corpus luteum cyst
Seminoma
Ovarian fibroma