Products of conception

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Products of conception, abbreviated POC, is stuff formed from the union of egg and sperm. This article covers POC superficially.

There are separate articles for chorionic villi and gestational trophoblastic disease.

General

Clinical

  • Therapeutic abortions - may be abbreviated "MVC" (manual vacuum aspiration).[1]

Screening tests

First trimester screen
  • PAPP-A.
  • Nuchal translucency.
  • Beta-hCG.
Maternal serum screen
  • Alpha-fetoprotein.
  • Beta-hCG.
  • Estriol.
Diagnostic tests
  • Chorionic villus sampling (10-12 weeks???).
  • Amniocentesis (15-16 weeks+).

Microscopic

Features:

  • Chorionic villi are need to call POC - key feature.
    • Cytotrophoblast.
    • Centre of villi often have fetal red blood cells (which have nuclei) -- not required for diagnosis of POC.
  • +/-Endometrium (intrauterine pregnancy):
    • Should have decidual changes -- mnemonic NEW:
      • Nucleus central.
      • Eosinophilic cytoplasm.
      • Well-defined cell borders.
  • +/-Uterine tube +/- decidualization (tubal pregnancy).
  • +/-Hyaline globules.[3]
  • +/-Embryo or fetus - a bonus.
    • Cartilage - common.
    • Primitive neuroepithelium.
    • Gastrointestinal epithelium.

Aside:

  • Embryo = conceptus before 8 weeks.
  • Fetus = conceptus 8th weeks 'til birth.

DDx:

Images

www:

Specific conditions

Arias-Stella reaction

General

Note:

  • To the novice... the nuclei look really scary, i.e. they look like cancer.

Microscopic

Features:[4]

  • Epithelial component of endometrium with large nuclei - key feature.
  • NC ratio is preserved.[5]
  • Usually a focal change.
  • +/-Mitoses - uncommon.

Notes:

  • No decidual reaction in the stroma.

DDx:

Images:

Subtypes

There are five subtypes:[4]

  1. Minimal atypia.
    • Usually early gestation.
  2. Early secretory pattern.
    • Mimics secretory endometrium: cytoplasmic vacuoles, central nucleus, palisading architecture.
  3. Secretory or hypersecretory pattern.
  4. Regenerative, proliferative or nonsecretory pattern.
  5. Monstrous cell pattern.

Ectopic pregnancy

General

Microscopic

See Microscopic section above.

DDx:

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FALLOPIAN TUBE, RIGHT, SALPINGECTOMY:
- FALLOPIAN TUBE WITH CHORIONIC VILLI (TUBAL PREGNANCY).

Micro

The sections show fallopian tube wall with chorionic villi.

Nucleated red blood cells are present. No other fetal components are identified.

The chorionic villi do not show a Norwegian fjord-like periphery. Central cisterns are not apparent. There is no trophoblastic proliferation.

Retained products of conception

General

  • May occur in a number of contexts, e.g. therapeutic abortion, sponatenous abortion.

Microscopic

See Microscopic section above.

DDx:

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ENDOMETRIUM, CURETTAGE:
- OUTLINES CONSISTENT WITH NON-VIABLE CHORIONIC VILLI WITH FIBRIN AND FOCAL 
  CALCIFICATIONS (COMPATIBLE WITH RETAINED PRODUCTS OF CONCEPTION).
- ENDOCERVICITIS, CHRONIC.
- NO DEFINITE ENDOMETRIUM.
- NO VIABLE CHORIONIC VILLI IDENTIFIED.
- NO EVIDENCE OF MALIGNANCY.

See also

References

  1. Edelman A, Nichols MD, Jensen J (June 2001). "Comparison of pain and time of procedures with two first-trimester abortion techniques performed by residents and faculty". Am. J. Obstet. Gynecol. 184 (7): 1564-7. PMID 11408881. http://linkinghub.elsevier.com/retrieve/pii/S0002937801372241.
  2. Barnhart, KT.; Simhan, H.; Kamelle, SA. (Oct 1999). "Diagnostic accuracy of ultrasound above and below the beta-hCG discriminatory zone.". Obstet Gynecol 94 (4): 583-7. PMID 10511363.
  3. Dharan M (September 2009). "Hyaline globules in ectopic decidua in a pregnant woman with cervical squamous cell carcinoma". Diagn. Cytopathol. 37 (9): 696–8. doi:10.1002/dc.21113. PMID 19526574.
  4. 4.0 4.1 4.2 Arias-Stella, J. (Jan 2002). "The Arias-Stella reaction: facts and fancies four decades after.". Adv Anat Pathol 9 (1): 12-23. PMID 11756756.
  5. 5.0 5.1 Tadrous, Paul.J. Diagnostic Criteria Handbook in Histopathology: A Surgical Pathology Vade Mecum (1st ed.). Wiley. pp. 236-7. ISBN 978-0470519035. . Cite error: Invalid <ref> tag; name "Ref_DCHH236-7" defined multiple times with different content

External links