Ovarian cyst
fluid-filled sac in the ovary
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Ovarian cysts are collections of fluids, surrounded by a very thin wall within an ovary. Ovarian follicles that are larger than two centimeters are termed ovarian cysts. The cysts range from pea-sized to just larger than an orange. Most cysts are functional in nature and harmless.
Ovarian cysts affect women of any age.