What is a corpus luteum cyst?

A corpus luteum cyst is a cystic structure formed in the ovary after the follicle has released an egg during ovulation. Its primary function is to produce progesterone, which is crucial for maintaining the uterine lining and supporting early pregnancy. If pregnancy occurs, the corpus luteum continues to secrete progesterone until the placenta is sufficiently developed to take over this hormone production.

This structure is temporary and will typically dissolve if pregnancy does not occur. Therefore, the correct understanding highlights the role of the corpus luteum cyst not just as a simple cyst but as an essential structure that supports early pregnancy by secreting progesterone. The other options relate to various ovarian structures or conditions but do not correctly characterize the function of a corpus luteum cyst. For instance, while it does secrete hormones, it does not primarily secrete estrogen during pregnancy, nor is it classified as a benign tumor, nor does its presence always indicate a miscarriage.