Corpus luteum cyst

After ovulation, the follicle that released the egg transforms into a temporary structure called the corpus luteum, which produces progesterone. Occasionally this structure fills with fluid or blood and enlarges into a corpus luteum cyst. Most corpus luteum cysts cause no symptoms and resolve within a few weeks, though some can cause pelvic discomfort or, rarely, bleeding requiring urgent assessment. They are also commonly seen in early pregnancy, where the corpus luteum supports hormone levels until the placenta takes over.

Also known as: luteal cyst

Last reviewed: 9 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.