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What are ovarian cysts?
An ovarian cyst is a fluid-filled sac, similar to a blister, that forms in an ovary. Ovarian cysts are the most common ovarian growths in women of childbearing age, 20 to 35 years old. They are seen more frequently in overweight women.1
All women develop small ovarian cysts during the menstrual cycle, when an egg matures in a small sac (follicle) on the surface of the ovary. Normally the egg is released from the sac (ovulation), and the sac dissolves. If the egg isn't released, or the sac doesn't dissolve, an ovarian cyst may form.
Less commonly, ovarian cysts may develop after treatment with certain infertility medications, or when another disease, such as endometriosis or pelvic inflammatory disease (PID) is present.
http://my.webmd.com/hw/womens_condit...tselectedguid={5FE84E90-BC77-4056-A91C-9531713CA348}