Women do make cysts in their ovaries from time to time after menopause. 10 mm is small, less than 1/2 inch. It takes 25 mm to make an inch. It is not possible for me to know if there were a cyst that ruptured or not with the information here, but if it was there and is gone, that is good. While the 10 mm cyst is probably not going to be a bad problem, the doctor might want to do a repeat scan either with CT or with an ultrasound in several months to see if it is enlarging.
Machelle M. Seibel, MD