This is when the cervix is so weak that it cannot hold the product of conception.
It is often cause by congenital weakness of the cervical os, previous trauma to the cervical os especially during birth, frequent surgical dilatation of the cervical os as in repeated d and c, cervical amputation.
The clinical feature of cervical incontinence include: painless recurrent abortion after the sixthteen week of pregnancy. The subsequent abortion occurre earlier than the current one.

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