This type can form when ovulation doesn't occur, and a follicle doesn't rupture or release its egg but instead grows until it becomes a cyst, or when a mature follicle involutes (collapses on itself). It usually forms during ovulation, and can grow to about 7 cm in diameter. It is thin-walled, lined by one or more layers of granulosa cell, and filled with clear fluid.
Follicular cyst of ovary
Ovarian fibroma
Corpus luteum cyst
Ovarian serous cystadenoma
Paraovarian cyst
Ovarian cyst
Ovarian mucinous tumor
Theca lutein cyst