What is the recurrence rate of dermoid cysts on the ovaries?

Dermoids don't recur: It is believed that dermoids of the ovaries "do not recur" once removed; they are probably present at birth; they may seem to recur but new ones may not be detectable until later when they grow and/or become symptomatic. Most women who are found to have a dermoid have only one single dermoid;10 to 15% of women may have more than one dermoid of varying sizes or may have dermoids in both ovaries