Difference between revisions of "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.
'''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]]''.
There are separate articles for ''[[chorionic villi]]'' and ''[[gestational trophoblastic disease]]''.


==History==
=General=
===Clinical===
*Therapeutic abortions - may be abbreviated "MVC" (manual vacuum aspiration).<ref>{{cite journal |author=Edelman A, Nichols MD, Jensen J |title=Comparison of pain and time of procedures with two first-trimester abortion techniques performed by residents and faculty |journal=Am. J. Obstet. Gynecol. |volume=184 |issue=7 |pages=1564-7 |year=2001 |month=June |pmid=11408881 |doi= |url=http://linkinghub.elsevier.com/retrieve/pii/S0002937801372241}}</ref>
*Therapeutic abortions - may be abbreviated "MVC" (manual vacuum aspiration).<ref>{{cite journal |author=Edelman A, Nichols MD, Jensen J |title=Comparison of pain and time of procedures with two first-trimester abortion techniques performed by residents and faculty |journal=Am. J. Obstet. Gynecol. |volume=184 |issue=7 |pages=1564-7 |year=2001 |month=June |pmid=11408881 |doi= |url=http://linkinghub.elsevier.com/retrieve/pii/S0002937801372241}}</ref>
*Diagnosis of pregnancy: beta-hCG > 10 mIU/mL.
**Beta-hCG calculator: [http://www.countdowntopregnancy.com/tools/beta_doubling_calculator.php http://www.countdowntopregnancy.com/tools/beta_doubling_calculator.php].
**If the beta-hCG is >1500 mIU/mL -- there is a good chance an ultrasound is diagnostic.<ref name=pmid10511363>{{Cite journal  | last1 = Barnhart | first1 = KT. | last2 = Simhan | first2 = H. | last3 = Kamelle | first3 = SA. | title = Diagnostic accuracy of ultrasound above and below the beta-hCG discriminatory zone. | journal = Obstet Gynecol | volume = 94 | issue = 4 | pages = 583-7 | month = Oct | year = 1999 | doi =  | PMID = 10511363 }}</ref>
====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+).
==Gross==
Fetal parts absent:
*Minimum of five cassettes.<ref>URL: [https://voices.uchicago.edu/grosspathology/peds-perinatal/products-of-conception/ https://voices.uchicago.edu/grosspathology/peds-perinatal/products-of-conception/]. Accessed on: 2023 April 3.</ref>


==Microscopic==
==Microscopic==
Line 11: Line 35:
**Cytotrophoblast.
**Cytotrophoblast.
**Centre of villi often have fetal red blood cells (which have nuclei) -- not required for diagnosis of POC.
**Centre of villi often have fetal red blood cells (which have nuclei) -- not required for diagnosis of POC.
*Should have decidual reaction of endometrium.
*+/-Endometrium (intrauterine pregnancy):
**Decidual changes -- mnemonic ''NEW'':
**Should have decidual changes -- mnemonic ''NEW'':
***Nucleus central.
***Nucleus central.
***Eosinophilic cytoplasm.
***Eosinophilic cytoplasm.
***Well-defined cell borders.
***Well-defined cell borders.
*Embryo or fetus - a bonus.
*+/-[[Uterine tube]] +/- decidualization (tubal pregnancy).
*+/-[[Hyaline globules]].<ref name=pmid19526574 >{{cite journal |author=Dharan M |title=Hyaline globules in ectopic decidua in a pregnant woman with cervical squamous cell carcinoma |journal=Diagn. Cytopathol. |volume=37 |issue=9 |pages=696–8 |year=2009 |month=September |pmid=19526574 |doi=10.1002/dc.21113 |url=}}</ref>
*+/-[[Hyaline globules]].<ref name=pmid19526574 >{{cite journal |author=Dharan M |title=Hyaline globules in ectopic decidua in a pregnant woman with cervical squamous cell carcinoma |journal=Diagn. Cytopathol. |volume=37 |issue=9 |pages=696–8 |year=2009 |month=September |pmid=19526574 |doi=10.1002/dc.21113 |url=}}</ref>
 
*+/-Embryo or fetus - a bonus.
Image:
**Cartilage - common.
*[http://commons.wikimedia.org/wiki/File:Endometrium_ocp_use2.jpg Decidualization due to OCP - high mag. (WC)].
**Primitive neuroepithelium.
**Gastrointestinal epithelium.


Aside:
Aside:
Line 26: Line 51:
*Fetus = conceptus 8th weeks 'til birth.
*Fetus = conceptus 8th weeks 'til birth.


==Beta-hCG==
DDx:
Calculator: [http://www.countdowntopregnancy.com/tools/beta_doubling_calculator.php http://www.countdowntopregnancy.com/tools/beta_doubling_calculator.php]
*[[Partial hydatidiform mole]].
 
====Images====
<gallery>
Image:Chorionic_villi_-_intermed_mag.jpg | Chorionic villi - intermed. mag. (WC)
Image:Products_of_conception_-_low_mag.jpg | Chorionic villi and fetal parts - low mag. (WC)
</gallery>
<gallery>
Image:Intermediate_trophoblast_3_-_low_mag.jpg | Intermediate trophoblast reaction - low mag. (WC)
Image:Intermediate_trophoblast_3_-_high_mag.jpg | Intermediate trophoblast - high mag. (WC)
</gallery>


==Ectopic pregnancy==
www:
*[[Chorionic villi]] have to be identified (in some location, e.g. [[Fallopian tube]]) to Dx a pregnancy.
*[http://www.gfmer.ch/selected_images_v2/detail_list.php?cat1=24&cat2=181&cat3=586&cat4=3&stype=n Tubal pregnancy - several images (gfmer.ch)].
*[[Endometrium]]: decidual reaction, as seen in any pregnancy.


=Specific conditions=
==Arias-Stella reaction==
==Arias-Stella reaction==
===General===
===General===
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**+/-Nuclear hyperchromasia, i.e. dark nuclei.
**+/-Nuclear hyperchromasia, i.e. dark nuclei.
**+/-Irregular nuclear membrane.
**+/-Irregular nuclear membrane.
**+/-Nuclear clearing.<ref name=Ref_DCHH236-7>{{Ref DCHH|236-7}}.</ref>  
**+/-Nuclear clearing.<ref name=Ref_DCHH236-7>{{Ref DCHH|236-7}}</ref>  
**+/-[[Nuclear pseudoinclusions]].
**+/-[[Nuclear pseudoinclusions]].
*[[NC ratio]] is preserved.<ref name=Ref_DCHH236-7>{{Ref DCHH|236-7}}</ref>
*[[NC ratio]] is preserved.<ref name=Ref_DCHH236-7>{{Ref DCHH|236-7}}</ref>
Line 59: Line 94:
*[[Choriocarcinoma]].
*[[Choriocarcinoma]].
*[[Herpes simplex virus|Herpetic]] [[endometritis]].
*[[Herpes simplex virus|Herpetic]] [[endometritis]].
*[[Clear cell carcinoma]].


Images:
====Images====
*[http://commons.wikimedia.org/wiki/File:Arias-Stella_reaction_-_low_mag.jpg Arias-Stella reaction - low mag. (WC)].
*[http://www2.odn.ne.jp/g_nexus_6/images/Arias-Stella.jpg Arias-Stella reaction (odn.ne.jp)]<ref>URL: [http://pathblog.wordpress.com/2009/01/23/what-is-arias-stella/ http://pathblog.wordpress.com/2009/01/23/what-is-arias-stella/]. Accessed on: September 8, 2014.</ref>
*[http://commons.wikimedia.org/wiki/File:Arias-Stella_reaction_-_high_mag.jpg Arias-Stella reaction - high mag. (WC)].


====Subtypes====
====Subtypes====
Line 74: Line 109:
#Monstrous cell pattern.
#Monstrous cell pattern.


==Screening tests==
==Ectopic pregnancy==
===First trimester screen===
===General===
*PAPP-A.
*[[Chorionic villi]] have to be identified (in some location, e.g. [[Fallopian tube]]) to Dx a pregnancy.
*Nuchal translucency.
*[[Endometrium]]: decidual reaction, as seen in any pregnancy.
*beta-hCG.
 
Clinical:
*Abdominal pain in woman of childbearing age.
**''Every woman of childbearing age should be assumed pregnant until proven otherwise!''<ref name=pmid23210111>{{Cite journal  | last1 = Doust | first1 = J. | title = A is for aphorism - a woman is pregnant until proven otherwise. | journal = Aust Fam Physician | volume = 41 | issue = 10 | pages = 827 | month = Oct | year = 2012 | doi =  | PMID = 23210111 |url = http://www.racgp.org.au/afp/2012/october/a-is-for-aphorism/ }}</ref>
*Typical gestational age (GA) for a tubal pregnancy ~ 5-9 weeks.<ref name=pmid9207811/>
**Beta-hCG elevated but may be relatively low (<100 IU/L) even in the context of (uterine tube) rupture.<ref name=pmid9207811>{{Cite journal  | last1 = Saxon | first1 = D. | last2 = Falcone | first2 = T. | last3 = Mascha | first3 = EJ. | last4 = Marino | first4 = T. | last5 = Yao | first5 = M. | last6 = Tulandi | first6 = T. | title = A study of ruptured tubal ectopic pregnancy. | journal = Obstet Gynecol | volume = 90 | issue = 1 | pages = 46-9 | month = Jul | year = 1997 | doi = 10.1016/S0029-7844(97)00180-4 | PMID = 9207811 }}</ref>
 
===Microscopic===
:See ''Microscopic'' section above.
 
DDx:
*Hydropic abortus.
*[[Complete hydatidiform mole]].
*[[Partial hydatidiform mole]].
 
====Images====
<gallery>
Image:Ectopic pregnancy -- low mag.jpg | EP - low mag. (WC)
Image:Ectopic pregnancy -- intermed mag.jpg | EP - intermed. mag. (WC)
Image:Ectopic pregnancy -- high mag.jpg | EP - high mag. (WC)
Image:Ectopic pregnancy - decidua -- intermed mag.jpg | EP - intermed. mag. (WC)
</gallery>
 
===Sign out===
<pre>
Fallopian Tube, Right Salpingectomy:
    - Fallopian tube with chorionic villi (tubal pregnancy).
</pre>
 
<pre>
Submitted as "Left Fallopian Tube and Ectopic Pregnancy", Excision:
    - Tubal pregnancy; Fallopian tube with chorionic villi and fetal parts.
</pre>
 
====Block letters====
<pre>
FALLOPIAN TUBE, RIGHT, SALPINGECTOMY:
- FALLOPIAN TUBE WITH CHORIONIC VILLI (TUBAL PREGNANCY).
</pre>
 
====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:
*[[Complete hydatidiform mole]].
*[[Partial hydatidiform mole]].
*[[Choriocarcinoma]].
 
===Sign out===
<pre>
Submitted as "Products of Conception":
- Chorionic villi present with degenerative changes, NEGATIVE for
  proliferation or significant atypia.
- Benign decidual tissue present.
- Necro-inflammatory debris and fibrin.
</pre>
 
====Variants====
<pre>
Submitted as "Products of Conception":
- Fetal tissue present.
- Benign decidual tissue present.
- Chorionic villi present, NEGATIVE for proliferation or significant atypia.
</pre>
 
<pre>
Submitted as "Products of Conception":
- Chorionic villi present with degenerative changes, negative for proliferation
  or significant atypia.
- Benign decidual tissue present.
- Negative for fetal tissue.
</pre>
 
<pre>
Products of Conception, Curettage:
- Chorionic villi present without proliferation or significant atypia.
- Decidua present.
- Negative for malignancy.
</pre>
 
====No chorionic villi====
<pre>
Submitted as "Products of Conception", Curettage:
- Blood and fibrin.
- Scant benign squamous epithelium and scant benign endocervical epithelium.
- NEGATIVE for decidua.
- NEGATIVE for chorionic villi, see comment.
 
Comment:
The tissue was submitted in total. Clinical correlation is suggested.
 
The above was communicated to the on call gynecologist.
</pre>
 
Notes:
*The above is considered a [[critical diagnosis]].
*It should be communicated to the on call gynecologist and this communication should be documented.
 
<pre>
Submitted as "Products of Conception":
    - Decidualized endometrium with necro-inflammatory changes/degeneration,
      blood and fibrin.
    - NEGATIVE for chorionic villi, see comment.
 
Comment:
The tissue was submitted in total.
 
The ultrasound impression (intrauterine gestational sac present) is noted. The decrease in serum beta-hCG is noted.


===Maternal serum screen===
The lack of chorionic villi on pathology is a discordance with the clinical findings.
*Alpha-fetoprotein.
A non-exhaustive list of possible explanations includes: non-removal/retention and prior spontaneous passing. Clinical correlation is required.
*Beta-hCG.
</pre>
*Estriol.


==Diagnostic tests==
====Block letters====
*Chorionic villus sampling (10-12 weeks???).
<pre>
*Amniocentesis (15-16 weeks+).
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.
</pre>


==See also==
=See also=
*[[Gynecologic pathology]].
*[[Gynecologic pathology]].
*[[Chorionic villi]].
*[[Chorionic villi]].
*[[Gestational trophoblastic disease]].
*[[Gestational trophoblastic disease]].
*[[Pregnancy luteoma]].


==References==
=References=
{{reflist|2}}
{{reflist|2}}
=External links=
*[http://www.perinatology.com/calculators/Crown%20Rump%20and%20Nuchal%20Translucency.htm Crown-rump length calculator (perinatology.com)].


[[Category:Gynecologic pathology]]
[[Category:Gynecologic pathology]]
[[Category:Diagnosis]]

Latest revision as of 16:24, 3 April 2023

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+).

Gross

Fetal parts absent:

  • Minimum of five cassettes.[3]

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.[4]
  • +/-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

  • Chorionic villi - intermed. mag. (WC)

  • Chorionic villi and fetal parts - low mag. (WC)

  • Intermediate trophoblast reaction - low mag. (WC)

  • Intermediate trophoblast - high mag. (WC)

www:

Specific conditions

Arias-Stella reaction

General

Note:

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

Microscopic

Features:[5]

  • Epithelial component of endometrium with large nuclei - key feature.
  • NC ratio is preserved.[6]
  • Usually a focal change.
  • +/-Mitoses - uncommon.

Notes:

  • No decidual reaction in the stroma.

DDx:

Images

Subtypes

There are five subtypes:[5]

  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

Clinical:

  • Abdominal pain in woman of childbearing age.
    • Every woman of childbearing age should be assumed pregnant until proven otherwise![8]
  • Typical gestational age (GA) for a tubal pregnancy ~ 5-9 weeks.[9]
    • Beta-hCG elevated but may be relatively low (<100 IU/L) even in the context of (uterine tube) rupture.[9]

Microscopic

See Microscopic section above.

DDx:

Images

  • EP - low mag. (WC)

  • EP - intermed. mag. (WC)

  • EP - high mag. (WC)

  • EP - intermed. mag. (WC)

Sign out

Fallopian Tube, Right Salpingectomy:
     - Fallopian tube with chorionic villi (tubal pregnancy).

Submitted as "Left Fallopian Tube and Ectopic Pregnancy", Excision:
     - Tubal pregnancy; Fallopian tube with chorionic villi and fetal parts.

Block letters

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:

Sign out

Submitted as "Products of Conception":
- Chorionic villi present with degenerative changes, NEGATIVE for 
  proliferation or significant atypia. 
- Benign decidual tissue present.
- Necro-inflammatory debris and fibrin.

Variants

Submitted as "Products of Conception":
- Fetal tissue present.
- Benign decidual tissue present.
- Chorionic villi present, NEGATIVE for proliferation or significant atypia.

Submitted as "Products of Conception":
- Chorionic villi present with degenerative changes, negative for proliferation 
  or significant atypia.
- Benign decidual tissue present.
- Negative for fetal tissue.

Products of Conception, Curettage:
- Chorionic villi present without proliferation or significant atypia.
- Decidua present.
- Negative for malignancy.

No chorionic villi

Submitted as "Products of Conception", Curettage:
- Blood and fibrin.
- Scant benign squamous epithelium and scant benign endocervical epithelium.
- NEGATIVE for decidua.
- NEGATIVE for chorionic villi, see comment.

Comment:
The tissue was submitted in total. Clinical correlation is suggested.

The above was communicated to the on call gynecologist.

Notes:

  • The above is considered a critical diagnosis.
  • It should be communicated to the on call gynecologist and this communication should be documented.
Submitted as "Products of Conception":
     - Decidualized endometrium with necro-inflammatory changes/degeneration, 
       blood and fibrin.
     - NEGATIVE for chorionic villi, see comment.

Comment:
The tissue was submitted in total. 

The ultrasound impression (intrauterine gestational sac present) is noted. The decrease in serum beta-hCG is noted.

The lack of chorionic villi on pathology is a discordance with the clinical findings. 
A non-exhaustive list of possible explanations includes: non-removal/retention and prior spontaneous passing. Clinical correlation is required.

Block letters

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. ↑ URL: https://voices.uchicago.edu/grosspathology/peds-perinatal/products-of-conception/. Accessed on: 2023 April 3.
  4. ↑ 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.
  5. ↑ 5.0 5.1 5.2 Arias-Stella, J. (Jan 2002). "The Arias-Stella reaction: facts and fancies four decades after.". Adv Anat Pathol 9 (1): 12-23. PMID 11756756.
  6. ↑ 6.0 6.1 Tadrous, Paul.J. Diagnostic Criteria Handbook in Histopathology: A Surgical Pathology Vade Mecum (1st ed.). Wiley. pp. 236-7. ISBN 978-0470519035.
  7. ↑ URL: http://pathblog.wordpress.com/2009/01/23/what-is-arias-stella/. Accessed on: September 8, 2014.
  8. ↑ Doust, J. (Oct 2012). "A is for aphorism - a woman is pregnant until proven otherwise.". Aust Fam Physician 41 (10): 827. PMID 23210111. http://www.racgp.org.au/afp/2012/october/a-is-for-aphorism/.
  9. ↑ 9.0 9.1 Saxon, D.; Falcone, T.; Mascha, EJ.; Marino, T.; Yao, M.; Tulandi, T. (Jul 1997). "A study of ruptured tubal ectopic pregnancy.". Obstet Gynecol 90 (1): 46-9. doi:10.1016/S0029-7844(97)00180-4. PMID 9207811.

External links

Retrieved from "https://librepathology.org/w/index.php?title=Products_of_conception&oldid=52277"