The fetal mandible: An in utero sonographic evaluation between 11 and 31 weeks' gestation

Yaron Zalel*, Liat Gindes, Reuven Achiron

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To construct a growth chart of the mandible throughout gestation. Methods: A prospective cross-sectional study of normal singleton pregnancies was conducted. Measurements of the fetal mandibular transverse and antero-posterior diameters were performed with high-resolution transvaginal and transabdominal ultrasonography in 490 pregnant women with singleton low-risk pregnancies between 11 and 31 weeks' gestation. Results: The mandibular transverse and antero-posterior diameters were recorded by week of gestation and the ratio was calculated: mandibular ratio (MR) = 1.7759 -0.01047 × gestational week. There was a negative linear correlation (-1.047%) for each incoming week of gestation. Normal values (±1SD and 2SD) were established. Conclusion: The present data provides a normal range of fetal mandibular diameters during normal pregnancies and introduces a new parameter, the mandibular ratio, for the intrauterine assessment of the fetal mandibular development.

Original languageEnglish
Pages (from-to)163-167
Number of pages5
JournalPrenatal Diagnosis
Volume26
Issue number2
DOIs
StatePublished - Feb 2006

Keywords

  • Fetus
  • Mandible
  • Mandibular ratio
  • Micrognathia
  • Prenatal diagnosis
  • Ultrasound

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