Whether a postmenopausal 8 cm chocolate cyst turns into ovarian cancer is not clear, the possibility of cancer is low, but close observation is needed. Coeliac cysts, or chocolate cysts, are named after the ectopic endometrium that bleeds during menstruation and the stale blood accumulates in the cavity of the cyst to form a dark brown substance on top of the endometriosis they suffer from. Although endometriosis is a high risk factor for ovarian cancer, it is not clear that it will eventually become cancerous. Regular medical checkups should be conducted during the day, and medical attention should be sought if lower abdominal discomfort occurs. In addition, an 8-centimeter-sized chocolate cyst, although not currently cancerous, should be treated promptly, and cyst removal as well as adhesion release can be done laparoscopically. Whether a postmenopausal cochlear cyst will become cancerous is not definitive, and regular physical examination and observation are still needed. Any discomfort or lower abdominal pain should be treated promptly, and the examination and treatment should be perfected.