Cervical insufficiency
A premature dilation of the cervix
Generally occurs in the 4th to 5th month of gestation, most commonly around 20 weeks’ gestation
Also called premature cervical dilation or incompetent cervix
Causes
Condition associated with congenital structural defects or previous cervical trauma resulting from surgery or delivery
May result from in utero exposure to diethylstilbestrol (DES)
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