Which term describes a fluid-filled sac found specifically on the ovary?

The term that specifically describes a fluid-filled sac found on the ovary is "ovarian cyst." Ovarian cysts are common and can vary in size, originating from the normal functions of the ovaries, such as follicular cysts that develop during the menstrual cycle. They may or may not cause symptoms, and while many cysts resolve on their own, some may require medical attention if they are persistent or symptomatic.

Other terms provided do not accurately refer to fluid-filled sacs located on the ovary. A sebaceous cyst typically occurs in the skin and contains sebum, while a general cyst can refer to a fluid-filled sac in various locations in the body, lacking the specificity to the ovary. Appendicitis refers to inflammation of the appendix and is unrelated to ovarian structures. Thus, "ovarian cyst" is the correct and precise term for this condition.