An ovarian cyst is a fluid-filled sac in the ovary.
Many cysts are completely normal.
These are called functional cysts. Functional cysts normally shrink over time, usually in about 1 to 3 months. If you are menopausal and are not having periods, you shouldn't form functional cysts. If you do have a cyst, your doctor will probably want you to have a sonogram, so he or she can look at the cyst. Diagnosis Sonography - This test helps to make a diagnosis of the presence of an ovarian cyst, determine the type of cyst and gives prediction whether the cyst is cancerous or non cancerous.