My sister 30years old underwent ovarian cystectomy on result of histopathology there is serous cyst adenoma what's next step she need any treatment ?

Serous Cystadenoma: If she had a serous cystadenoma, she may be at risk for this happening again and needs to be followed closely. Still, it isn't a true cancer so she doesn't need any other treatment other than close monitoring. Still, she should consider her family building options and consider oocyte or embryo cryopreservation if she isn't trying to get pregnant soon because this can recur.