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Fetal penile length.

P Johnson1, D Maxwell

  • 1Imperial College School of Medicine, Institute of Obstetrics and Gynaecology, Queen Charlotte's and Chelsea Hospital, London, UK. pjohnson@ic.ac.uk

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
|July 15, 2000
PubMed
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Fetal penile length reference ranges were established using ultrasound. This measurement aids in diagnosing congenital anomalies like urethral agenesis in male fetuses.

Area of Science:

  • Prenatal diagnosis
  • Fetal medicine
  • Medical imaging

Background:

  • Establishing normative data for fetal anatomical measurements is crucial for prenatal diagnosis.
  • Fetal penile length (FPL) has not been extensively studied to create a reliable reference range.

Purpose of the Study:

  • To construct a comprehensive reference range for fetal penile length (FPL) across different gestational ages.
  • To evaluate the utility of FPL measurement in identifying specific fetal anomalies.

Main Methods:

  • Ultrasound biometry was employed to measure penile length in 95 structurally normal male fetuses.
  • Gestational ages ranged from 16 to 38 weeks.
  • Two fetuses with known bladder outflow obstruction were included for comparative analysis.

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Main Results:

  • A significant positive correlation was observed between fetal penile length and gestational age.
  • Mean FPL increased from 6.0 mm at 16 weeks to 26.4 mm at 38 weeks.
  • One fetus diagnosed with urethral agenesis presented with a penile length at the 0.3rd centile.

Conclusions:

  • Fetal penile length measurement is a practical and time-efficient ultrasound assessment.
  • FPL assessment can aid in differentiating between urethral agenesis and posterior urethral valves in cases of bladder outflow obstruction.