Abnormal Development - Ectopic Implantation: Difference between revisions
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==Interstitial Pregnancy== | ==Interstitial Pregnancy== | ||
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(cornual pregnancy) A less common type 2 to 4% of ectopic pregnancies. The gestation develops in the uterine portion of the fallopian tube lateral to the round ligament. | | (cornual pregnancy) A less common type 2 to 4% of ectopic pregnancies. The gestation develops in the uterine portion of the fallopian tube lateral to the round ligament. | ||
| [[File:Interstitial-ectopic pregnancy.jpg|thumb|Interstitial ectopic pregnancy<ref><pubmed>20725587</pubmed>| [http://www.egms.de/static/en/journals/gms/2010-8/000105.shtml German Medical Science]</ref>]] | |||
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==Cervical Ectopic Pregnancy== | ==Cervical Ectopic Pregnancy== |
Revision as of 13:01, 30 July 2011
Introduction
Human development during week 2 is about implantation and the endocrine signaling to block the normal menstrual cycle. The blastocyst implantation process should normally and does occur within the body of the uterus. There are a number of additional abnormal sites of implantation that are outside the uterine body, these are described as ectopic implantation or ectopic pregnancy. The most common form of human ectopic pregnancy is when implantation occurs within the uterine tube, described as a tubal pregnancy. Note that the endocrine signals blocking the menstrual cycle and indicating a pregnancy will still be released following this ectopic implantation. Ectopic pregnancies are therefore often identified by early ultrasound scans.
Ectopic pregnancy is also a high-risk maternal medical condition with an approximate incidence of 1.5 to 2 % in reported pregnancies. This is also the most common cause of pregnancy-related deaths in the first trimester. The risk factors for tubal ectopic pregnancy include: tubal damage by infection (particularly Chlamydia trachomatis) or surgery, smoking and in vitro fertilization therapy. Prolonged tubal damage is often described as pelvic inflammatory disease and "scarring" can affect the cilia-mediated transport of the blastocyst during the first week of development.
- Links: Implantation | Week 2
Some Recent Findings
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Ultrasound Ectopic Implantation
Movie Flash | Quicktime | |
Ultrasound image of ectopic tubal pregnancy |
Ectopic Pregnancy Histology
CDC Image by Dr. Edwin P. Ewing, Jr., 1972
Ed Uthman Image (pathologist in Houston, Texas) section of ectopic (tubal) pregnancy about Carnegie stage 7 in Week 3.
Image version links: ExtraLarge 1712x1206px | Large 1024x721px | Medium 500x352px | Small 240x169px
Ed Uthman Image (pathologist in Houston, Texas) image of of ectopic (tubal) pregnancy about Carnegie stage 15 in Week 5.
Image version links: ExtraLarge 1874 x 2000px | Large 959 x 1024px | Medium 468 x 500px | Small 225 x 240px
Tubal Ectopic Pregnancy
Chlamydia infections (Chlamydia trachomatis) are the most common bacterial sexually transmitted infection, often undiagnosed and asymptomatic. The infections can ascend the female genital tract, colonizing the endometrial mucosa, then the uterine tubes. This type of infection is described as pelvic inflammatory disease (PID).
Interstitial Pregnancy
(cornual pregnancy) A less common type 2 to 4% of ectopic pregnancies. The gestation develops in the uterine portion of the fallopian tube lateral to the round ligament. |
Cervical Ectopic Pregnancy
This form of ectopic pregnancy is a rare high-risk condition and represents less than 1% of all ectopic pregnancies. The reported incidence varies between 1:1,000 to 1:18,000.
Rudimentary Horn Pregnancy
A rare types of ectopic pregnancy (about 1 in 76,000 pregnancies) in most cases the horn is non-communicating. Therefore fertilisation probably occurs by transperitoneal migration. This form untreated can also lead to uterine rupture.
Cornual Pregnancy
Cornual (interstitial) ectopic pregnancy is an uncommon variant of ectopic pregnancy.
Caesarean Scar Pregnancy
A rare types of ectopic pregnancy (about 1 in 2000 pregnancies), but probably increasing as caesarean rates rise. The gestation is completely surrounded by both myometrium and fibrous tissue of the caesarean section scar and separated from the endometrial cavity and endocervical canal.
References
- ↑ <pubmed>20023297</pubmed>
- ↑ <pubmed>20725587</pubmed>| German Medical Science
Reviews
<pubmed>20071358</pubmed> <pubmed>20023297</pubmed> <pubmed>16595714</pubmed>
Articles
<pubmed>7194809</pubmed> <pubmed>19978839</pubmed>
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Cite this page: Hill, M.A. (2024, June 14) Embryology Abnormal Development - Ectopic Implantation. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Abnormal_Development_-_Ectopic_Implantation
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G