An ovarian cyst is a sac filled with fluid, or a semisolid material, that develops on or within the ovary. Ovarian cysts are relatively common and usually disappear without treatment.
Review Date 1/30/2020
Updated by: LaQuita Martinez, MD, Department of Obstetrics and Gynecology, Emory Johns Creek Hospital, Alpharetta, GA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.