Size of the ovary is based completely on the internal changes or extra growth that is ongoing. It is difficult to get more details on the exact morphology and pathology of the cyst
, as this is usually done after removal of the ovary(ies).
Which is why I would advise removal of both ovaries to avoid all such complications, although you are still young, it is a decision you will have to make based on the pros and cons.
Hope this helps.