The advantages of hysterectomy in molar nr are:
Chance for pulmonary embolisation is minimal and also it reduces the tumour burden and limit the chemotherapy. For more details refer page no 174 of text book of obsteics, sheila balakrishnan,2 nd edition.
Chance of choriocarcinoma becomes nil
Follow up is not required
Enlarged ovaries can be removed during oper
Chance of pulmonary embolisation is minimal
General obstetrics