To confirm or rule it out, a further test is offered - either amniocentesis and chorionic villus sampling, both of which use a fine needle to take tissue or fluid from inside the womb.
The expected course of ovarian cysts varies with a woman's age, the size of the cyst, whether there is a family history of ovarian cysts, and whether the cyst is fluid-filled, appears to be a solid mass of tissue, or has both fluid and solid components.