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. 1981 Jun;88(6):640-3.
doi: 10.1111/j.1471-0528.1981.tb01222.x.

Ultrasonography in the diagnosis of cervical incompetence in pregnancy-a new diagnostic approach

I Brook, M Feingold, A Schwartz, H Zakut

Ultrasonography in the diagnosis of cervical incompetence in pregnancy-a new diagnostic approach

I Brook et al. Br J Obstet Gynaecol. 1981 Jun.

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.

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