10 year old has cyst on ovary, any alternative to surgery?

Several days ago my cousin felt abdominal pain. After undergoing several tests, doctors discovered a cyst on her ovary. FYI my cousin is only 10 years old. The doctor recommend that she should undergo for surgery because his cyst is already has 10 cm diameter.
I would like to ask is there any side effects after cyst removal surgery(such as infertility or other side effect)?
Is there other alternatives to remove the cysts beside surgery?

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