What is defined as a fluid-filled sac on or within an ovary?

An ovarian cyst is a fluid-filled sac that forms on or within an ovary. These cysts are relatively common and can vary in size. They often develop during the menstrual cycle and may be functional, such as follicular or corpus luteum cysts, or they can be pathological. Most ovarian cysts are benign and may resolve on their own within a few menstrual cycles. Recognizing this definition is crucial for understanding various conditions related to women's reproductive health and differentiating ovarian cysts from other disorders.

Endometriosis, pelvic inflammatory disease, and fibroid tumors involve different mechanisms and pathologies. Endometriosis refers to the presence of endometrial-like tissue outside the uterus, leading to pain and potential fertility issues. Pelvic inflammatory disease is an infection of the female reproductive organs that can cause various complications and does not necessarily involve cyst formation. Fibroid tumors, on the other hand, are non-cancerous growths of the uterus made up of muscle and fibrous tissue, rather than fluid-filled sacs on the ovaries. Thus, identifying an ovarian cyst specifically as a fluid-filled structure is essential in understanding gynecological pathologies.