Ovarian cysts form when fluid accumulates within a membrane inside an ovary. A cyst is like a sac, a pocket of fluid just like a blister, and the membrane which encases it separates it from the other ...
Editor's Note: In May 2026, the Endocrine Society and other international experts officially renamed polycystic ovary syndrome (PCOS) polyendocrine metabolic ovarian syndrome (PMOS). This change ...