And remember, even in postmenopausal women, the majority of cysts are still benign :)
I hope to bring you some hope as I'm facing a situation similar to yours. I have three complex cysts on my ovaries and my ca 125 was elevated at 92. My gyno truly thinks it is endometriosis with endometriomas (cysts). However I have to see an oncologist now because of the ca 125. If you had endo before and they left your ovaries, estrogen can still feed any endometriosis that was left from surgery. From what I've read, it is very likely some can be left because it can be microscopic and hidden and very easily missed. I wish I could take my own advice but if your ca 125 comes back elevated, please don't panic: endo raises the test. I have a suspicion that this may be your case but since you have a family history I would suggest you maybe should see an oncologist. Although I panic at the thought I have to do it, at least I know I'm in good hands. And from what I've read, no free fluid is a really good thing. Prayers are with you, please keep us posted.