Ovarian cysts form for numerous reasons. The most common
type is called a follicular cyst. A follicle is the fluid-filled sac that contains the
egg. Follicular cysts form when the follicle grows larger than normal during the
menstrual cycle and does not open to release the egg. Normally, follicular cysts resolve
themselves over time.
Another menstrual cycle-related
ovarian cyst is a corpus luteum cyst. The corpus luteum is an area of tissue within the
ovary that appears 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 develop as a cyst on the ovary. This cyst is typically
found on only one side and has no symptoms.
Some other less
common types of cysts that develop in the ovaries include cystic teratomas, dermoid
cysts, and endometrioma.
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