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Placental cavities

T Fujikura1, S Sho

  • 1Department of Pathology, Keio University, School of Medicine, Tokyo and Sho Hospital, Japan.

Obstetrics and Gynecology
|July 1, 1997
PubMed
Summary
This summary is machine-generated.

Placental cavities, common in heavy placentas with male fetuses, show villus laceration and can contain intervillous thrombosis. These findings highlight placental cavity vulnerability during detachment.

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Area of Science:

  • Obstetrics and Gynecology
  • Fetal Medicine
  • Pathology

Background:

  • Placental cavities are anatomical spaces within the placenta.
  • Their association with specific placental characteristics and fetal sex requires further investigation.

Purpose of the Study:

  • To investigate placental cavities using gross, microscopic, and ultrasonographic methods.
  • To determine the frequency of placental cavities and their correlation with epidemiologic factors and intervillous thrombosis.

Main Methods:

  • Examination of 567 formalin-fixed placental sections for cavities and intervillous thrombosis.
  • Histologic and ultrasonographic analysis of identified cavities.
  • Correlation with placental weight, thickness, and fetal sex.

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Main Results:

  • Placental cavities (≥1 cm diameter) were found in 34.9% of placentas.
  • Cavities were more frequent in heavy, thick placentas associated with male fetuses.
  • Histology revealed villus laceration within cavities, with air bubbles and villous tissue in fetal veins; intervillous thrombosis was exclusively found in cavities.

Conclusions:

  • Placental cavities are significantly associated with heavy, thick placentas and male fetuses.
  • Villus laceration within cavities, potentially due to uterine contractions during detachment, can lead to fetal vein contamination.
  • Intervillous thrombosis is confined to placental cavities, indicating a specific pathological relationship.