donald’s Shirodkar’s Diagnosis History is very important.There is acute , painless dilatation of the cervix in the mid trimester leading to the sudden gush of vaginal fluid followed by abortion. Cause Congenital Acquired–obstetric trauma to the cervix. Treatment Cervical cerclage– Contraindications of cervical cerclage— Rupture of fetal membranes Vaginal bleeding IUD Gestation