Discussion of Cervical incompetence
- Cervical incompetence is a common cause of pregnancy failure in the second trimester
- Manifests as painless dilatation of the cervix that leads to preterm labor.
- Cervical incompetence may present with premature rupture of membranes, resulting in oligohydramnios.
 Imaging Findings for Cervical incompetence
- Sonographic findings include bulging of the fetal membranes into a widened internal os and shortening of the cervical canal.
- The cervical length is obtained by measuring the endocervical canal from the internal cervical os to the external cervical os.
- Endovaginal sonography is the more accurate method.
- The mean cervical length is normally greater than 3 cm.
- The sonographic determination of the residual closed length of the cervix may be used as a prognostic indicator for the risk of preterm labor progressing into preterm delivery.
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 References for Cervical incompetence
- Kaakaji, Y., Nghiem, H. V., Nodell, C., Winter, T. C. Sonography of Obstetric and Gynecologic Emergencies: Part I, Obstetric Emergencies. Am. J. Roentgenol. 2000 174: 641-649