Ovarian Cysts (cont.)

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What causes ovarian cysts?

Ovarian cysts form for numerous reasons. The most common type is a follicular cyst, which results from the growth of a follicle. A follicle is the normal fluid-filled sac that contains an egg. Follicular cysts form when the follicle grows larger than normal during the menstrual cycle and does not open to release the egg. Usually, follicular cysts resolve spontaneously over the course of days to months. Cysts can contain blood (hemorrhagic cysts) from leakage of blood into the egg sac.

Another type of ovarian cyst that is related to the menstrual cycle is a corpus luteum cyst. The corpus luteum is an area of tissue within the ovary that occurs after an egg has been released from a follicle. If a pregnancy doesn't occur, the corpus luteum usually breaks down and disappears. It may, however, fill with fluid or blood and persist as a cyst on the ovary. Usually, this cyst is found on only one side, produces no symptomsand resolves spontaneously.

Endometriosis is a condition in which cells that normally grow inside as a lining of the uterus (womb), instead grow outside of the uterus in other locations. The ovary is a common site for endometriosis. When endometriosis involves the ovary, the area of endometrial tissue may grow and bleed over time, forming a blood-filled cyst with red- or brown-colored contents called an endometrioma, sometimes referred to as a chocolate cyst or endometrioma. The condition known as polycystic ovarian syndrome (PCOS) is characterized by the presence of multiple small cysts within both ovaries. PCOS is associated with a number of hormonal problems and is the most common cause of infertility in women.

Both benign and malignant tumors of the ovary may also be cystic. Occasionally, the tissues of the ovary develop abnormally to form other body tissues such as hair or teeth. Cysts with these abnormal tissues are really tumors called denign cystic teratomas or dermoid cysts.

Infections of the pelvic organs can involve the ovaries and Fallopian tubes. In severe cases, pus-filled cystic spaces may be present on or around the ovary or tubes. These are known as tubo-ovarian abscesses.

Medically Reviewed by a Doctor on 12/13/2013

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