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Partial moles: from postnatal to prenatal diagnosis.

E Jauniaux1

  • 1Academic Departments of Obstetrics and Gynaecology, University College London (UCH), London, UK. e.jauniaux@ucl.ac.uk

Placenta
|July 27, 1999
PubMed
Summary

Partial hydatidiform mole, often caused by triploidy, frequently results in fetal growth restriction and anomalies. Early diagnosis via MShCG and cytogenetics is crucial for managing this lethal condition.

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Area of Science:

  • Reproductive Medicine
  • Genetics
  • Fetal Medicine

Background:

  • Partial hydatidiform mole is a histopathologic entity with focal trophoblastic hyperplasia, villous hydrops, and fetal tissue.
  • Advances in molecular biology link over 90% of partial moles to diandric triploidy.
  • Triploidy is a significant cause of persistent trophoblastic disease following partial mole.

Purpose of the Study:

  • To review case series on prenatal diagnosis of triploid partial mole.
  • To analyze pregnancy outcomes for triploid partial mole and compare them to non-molar triploidy.
  • To highlight diagnostic challenges and management recommendations.

Main Methods:

  • Review of case series describing prenatal diagnosis of triploid partial mole.
  • Outcome analysis of pregnancies with triploid partial mole and non-molar triploidy.
  • Chi-square test for comparing outcomes between groups.

Main Results:

  • Over 90% of triploid fetuses (molar and non-molar) exhibit growth restriction and multiple structural anomalies.
  • Triploid partial mole cases show 82.1% symmetrical growth restriction, 80.8% elevated maternal serum human chorionic gonadotropin (MShCG), and 41.9% risk of pre-eclampsia.
  • Typical molar features may not be apparent on early ultrasound.

Conclusions:

  • Triploid partial mole is a lethal fetal condition associated with gestational trophoblastic disorders.
  • Diagnosis relies on MShCG levels, cytogenetics, and histopathology, as ultrasound findings can be non-specific.
  • Immediate termination and specific follow-up are recommended for women diagnosed with this condition.

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