BJOG An International Journal of Obstetrics & Gynaecology · 1981 · 53 citations · 1 references
MedicineGynecologyObstetricsObstetric UltrasoundUltrasonographyUltrasoundCervical ImagingCervical UltrasonographyCervical UltrasoundDiagnostic UltrasonographyObstetric UltrasonographyPregnancy DiagnosisCervical Anatomy AssessmentInternal Os AssessmentInternal Os EvaluationTransvaginal Cervical Ultrasonography
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.
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