title: Ultrasonography in the diagnosis of cervical incompetence in pregnancy-a new diagnostic approach.
abstract: Ultrasonography was used to measure the width of the internal os in 24 patients, for whom a McDonald operation was planned because they were considered to have cervical incompetence and in 19 women with normal obstetric histories. The mean widths of the internal os were 2.57 cm +/- 0.36 and 1.67 cm +/- 0.23, respectively (p less than 0.001). This new and objective procedure, which is used during pregnancy, provides an additional method for the diagnosis of cervical incompetence.
mesh_terms: D002584:Cervix Uteri / Q000601:surgery; D005260:Female; D006801:Humans; D008722:Methods; D011247:Pregnancy; D014463:Ultrasonography; D002581:Uterine Cervical Incompetence / Q000175:diagnosis* / Q000601:surgery