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Histopathologic patterns in isthmocele pregnancies.

Badr AbdullGaffar1, Tasnim Keloth1, Fatma B Zarooni2

  • 1Dubai Hospital, Dubai, United Arab Emirates.

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|January 5, 2025
PubMed
Summary
This summary is machine-generated.

Isthmoceles, defects from Caesarean section scars, can lead to ectopic pregnancies. Histopathologic review of these isthmocele pregnancies reveals diverse lesions, crucial for accurate diagnosis and patient management.

Keywords:
Caesarean sectionGestational trophoblastic diseaseIsthmocelePregnancyScar

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Area of Science:

  • Reproductive Medicine
  • Gynecologic Pathology
  • Obstetrics

Background:

  • Isthmoceles are Caesarean section (CS) defects linked to infertility and IVF challenges.
  • These scars can harbor ectopic pregnancies and abnormal placentation.
  • Limited histopathologic data exists for gestations within isthmoceles.

Purpose of the Study:

  • To illustrate histopathologic patterns of conception products and trophoblastic lesions in isthmoceles.
  • To determine the clinical relevance of gestational isthmoceles.
  • To address the diagnostic challenges in identifying these lesions.

Main Methods:

  • Retrospective review of isthmocele specimens from hysteroscopic isthmoplasty and hysterectomies.
  • Analysis of 14 cases of isthmocele ectopic pregnancies.
  • Histopathologic examination with special stains and immunohistochemistry.

Main Results:

  • 14 (7.4%) isthmocele ectopic pregnancies identified, often in large, low-level endocervical isthmoceles.
  • Lesions included placental site nodule/plaque (43%), incomplete abortus, atypical nodules, exaggerated placental site, and epithelioid trophoblastic tumor.
  • Diagnostic pitfalls included misinterpretation of small lesions and confusion with cervical cancer, resolved by trophoblast-specific markers.

Conclusions:

  • Large, low-level endocervical isthmoceles are prone to ectopic pregnancies.
  • Previous scar pregnancies are a risk factor for subsequent isthmocele ectopic pregnancies.
  • Pathologists must recognize diverse histopathologic changes in gestational isthmoceles to guide clinical management and avoid misdiagnosis.