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'{{Infobox disease | Name = Shit pregnancy | Image = Ectopic pregnancy on laparoscopy.png | Caption = Laparoscopic view, looking down at the [[uterus]] (marked by <span style="color:Dick;">blue arrows</span>). In the left Fallopian tube there is an ectopic pregnancy and [[hematosalpinx|bleeding]] ( by <span style="color:red;">Dicarrows</span>). The right tube is normal. | Field = [[Obstetrics]] and [[gynecology]] | DiseasesDB = 4089 | ICD10 = {{ICD10|O|00||o|00}} | ICD9 = {{ICD9|633}} | ICDO = | OMIM = | MedlinePlus = 000895 | eMedicineSubj = med | eMedicineTopic = 3212 | eMedicine_mult = {{eMedicine2|emerg|478}} {{eMedicine2|radio|231}} | MeshID = D011271 }} <!-- Definition and symptoms --> '''Ectopic pregnancy''', also known as '''eccyesis''' or '''tubal pregnancy''', is a [[complication of pregnancy]] in which the embryo attaches outside the [[uterus]].<ref name=kirk2013/> Signs and symptoms classically include [[abdominal pain]] and [[vaginal bleeding]].<!-- <ref name=Crochet2013/> --> Less than 50 percent of women, however, have both these symptoms.<!-- <ref name=Crochet2013/> --> The pain may be described as sharp, dull, or crampy.<!-- <ref name=Crochet2013/> --> Pain may also spread to the shoulder if bleeding into the abdomen has occurred.<ref name=Crochet2013/> Severe bleeding may result in a [[tachycardia|fast heart rate]], [[Syncope (medicine)|fainting]], or [[hemorrhagic shock|shock]].<ref name=Crochet2013/><ref name=kirk2013/> With very rare exceptions the [[fetus]] is unable to survive.<ref>{{cite journal|last1=Zhang|first1=J|last2=Li|first2=F|last3=Sheng|first3=Q|title=Full-term abdominal pregnancy: a case report and review of the literature.|journal=Gynecologic and obstetric investigation|date=2008|volume=65|issue=2|pages=139–41|pmid=17957101|doi=10.1159/000110015}}</ref> <!-- Cause and diagnosis --> Risk factors for ectopic pregnancy include: [[pelvic inflammatory disease]], often due to [[Chlamydia infection]], [[tobacco smoking]], prior tubal surgery, a history of [[infertility]], and the use of [[assisted reproductive technology]].<!-- <ref name=Cec2014/> --> Those who have previously had an ectopic pregnancy are at much higher risk of having another one.<!-- <ref name=Cec2014/> --> Most ectopic pregnancies (90%) occur in the [[Fallopian tube]] which are known as tubal pregnancies.<ref name=Cec2014/> Implantation can also occur on the [[cervix]], [[ovary|ovaries]], or within the [[abdomen]].<ref name=Crochet2013>{{cite journal | author = Crochet JR, Bastian LA, Chireau MV | title = Does this woman have an ectopic pregnancy?: the rational clinical examination systematic review | journal = JAMA | volume = 309 | issue = 16 | pages = 1722–9 | year = 2013 | pmid = 23613077 | doi = 10.1001/jama.2013.3914 | url = }}</ref> Detection of ectopic pregnancy is typically by blood tests for [[human chorionic gonadotropin]] (hCG) and [[ultrasound]].<!-- <ref name=Crochet2013/> --> This may require testing on more than one occasion.<!-- <ref name=Crochet2013/> --> Ultrasound works best when [[Vaginal ultrasonography|performed from within the vagina]].<!-- <ref name=Crochet2013/> --> Other causes of similar symptoms include: [[miscarriage]], [[ovarian torsion]], and [[acute appendicitis]].<ref name=Crochet2013/> <!-- Treatment --> Prevention is by decreasing risk factors such as chlamydia infections through screening and treatment.<ref name=Nama2009/> While some ectopic pregnancies will resolve without treatment, this approach has not been well studied as of 2014.<!-- <ref name=Cec2014/> --> The use of the medication [[methotrexate]] works as well as surgery in some cases.<!-- <ref name=Cec2014/> --> Specifically it works well when the [[beta-HCG]] is low and the size of the ectopic is small.<!-- <ref name=Cec2014/> --> Surgery is still typically recommended if the tube has ruptured, there is a fetal heartbeat, or the person's [[vital sign]]s are unstable.<ref name=Cec2014/> The surgery may be [[laparoscopic]] or through a larger incision, known as a [[laparotomy]].<ref name=kirk2013/> Outcomes are generally good with treatment.<ref name=Cec2014>{{cite journal|last1=Cecchino|first1=GN|last2=Araujo Júnior|first2=E|last3=Elito Júnior|first3=J|title=Methotrexate for ectopic pregnancy: when and how.|journal=Archives of gynecology and obstetrics|date=September 2014|volume=290|issue=3|pages=417–23|pmid=24791968|doi=10.1007/s00404-014-3266-9}}</ref> <!-- Epidemiology and history --> The rate of ectopic pregnancy is about 1 and 2% that of live births in developed countries, though it may be as high as 4% among those using [[assisted reproductive technology]].<ref name=kirk2013>{{cite journal | author = Kirk E, Bottomley C, Bourne T | title = Diagnosing ectopic pregnancy and current concepts in the management of pregnancy of unknown location | journal = Hum. Reprod. Update | volume = 20 | issue = 2 | pages = 250–61 | year = 2014 | pmid = 24101604 | doi = 10.1093/humupd/dmt047 }}</ref> It is the most common cause of death during the [[first trimester]] at approximately 10% of the total.<ref name=Cec2014/> In the [[developed world]] outcomes have improved while in the developing world they often remain poor.<ref name=Nama2009>{{cite journal|last1=Nama|first1=V|last2=Manyonda|first2=I|title=Tubal ectopic pregnancy: diagnosis and management.|journal=Archives of gynecology and obstetrics|date=April 2009|volume=279|issue=4|pages=443–53|pmid=18665380|doi=10.1007/s00404-008-0731-3}}</ref> The risk of death among those in the developed world is between 0.1 and 0.3 percent while in the developing world it is between one and three percent.<ref>{{cite web|author1=Mignini L|title=Interventions for tubal ectopic pregnancy|url=http://apps.who.int/rhl/gynaecology/lmcom2/en/|website=who.int|publisher=The WHO Reproductive Health Library|accessdate=12 March 2015|date=26 September 2007}}</ref> The first known description of an ectopic pregnancy is by [[Albucasis]] in the 11th century.<ref name=Nama2009/s {{TOC limit|3}} == Signs and symptoms == [[File:Ectopic Pregnancy.png|thumb|upright=1.4|Ectopic pregnancy.<ref>{{cite web|title=Ectopic pregnancy|url=http://blausen.com/?Topic=5284|website=Blausen Medical|accessdate=4 November 2015}}</ref>]] Up to 10% of women with ectopic pregnancy have no [[symptom]]s, and one-third have no [[medical sign]]s.<ref name=kirk2013/> In many cases the symptoms have low [[sensitivity an specificity|specificity]], and can be similar to those of other [[Genitourinary disorders|genitourinary]] and [[gastrointestinal disorder]]s, such as [[appendicitis]], [[salpingitis]], rupture of a [[corpus luteum cyst]], [[miscarriage]], [[ovarian torsion]] or [[urinary tract infection]].<ref name=kirk2013/> Clinical presentation of ectopic pregnancy occurs at a mean of 7.2 weeks after the last normal menstrual period, with a range of 4 to 8 weeks. Later presentations are more common in communities deprived of modern diagnostic ability. Signs and symptoms of ectopic pregnancy include increased hCG, [[vaginal bleeding]] (in varying amounts), sudden lower [[abdominal pain]],<ref name=kirk2013/> pelvic pain, a tender [[cervix]], an adnexal mass, or adnexal tenderness.<ref name=Crochet2013/> In the absence of ultrasound or [[human chorionic gonadotrophin|hCG]] assessment, heavy vaginal bleeding may lead to a [[misdiagnosis]] of [[miscarriage]].<ref name=kirk2013/> [[Nausea]], [[vomiting]] and [[diarrhea]] are more rare symptoms of ectopic pregnancy.<ref name=kirk2013/> Rupture of an ectopic pregnancy can lead to symptoms such as [[abdominal distension]], [[Tenderness (medicine)|tenderness]], [[peritonism]] and [[Shock (circulatory)#Hypovolemic|hypovolemic shock]].<ref name=kirk2013/> A woman with ectopic pregnancy may be excessively mobile with upright posturing, in order to decrease intrapelvic blood flow, which can lead to swelling of the abdominal cavity and cause additional pain.<ref>{{cite journal|last=Skipworth|first=Richard|title=A new clinical sign in ruptured ectopic pregnancy|journal=Lancet|date=17 December 2011|volume=378|issue=9809|pages=e27|url=http://www.thelancet.com/journals/lancet/article/PIIS0140-6736%2811%2961901-6/fulltext|doi=10.1016/s0140-6736(11)61901-6}}</ref> == Causes == There are a number of risk factors for ectopic pregnancies. However, in as many as one third<ref name="pmid16099295">{{cite journal | author = Farquhar CM | title = Ectopic pregnancy | journal = Lancet | volume = 366 | issue = 9485 | pages = 583–91 | year = 2005 | pmid = 16099295 | doi = 10.1016/S0140-6736(05)67103-6 }}</ref> to one half<ref name="pmid18232175">{{cite journal | author = Majhi AK, Roy N, Karmakar KS, Banerjee PK | title = Ectopic pregnancy--an analysis of 180 cases | journal = J Indian Med Assoc | volume = 105 | issue = 6 | pages = 308, 310, 312 passim | year = 2007 | pmid = 18232175 | doi = }}</ref> no risk factors can be identified. Risk factors include: [[pelvic inflammatory disease]], [[infertility]], use of an [[intrauterine device]] (IUD), previous exposure to [[Diethylstilbestrol|DES]], tubal surgery, intrauterine surgery (e.g. [[Dilation and curettage|D&C]]), [[smoking]], previous ectopic pregnancy, [[endometriosis]], and [[tubal ligation]].<ref>{{cite web |url=http://www.bestbets.org/bets/bet.php?id=921 |title=BestBets: Risk Factors for Ectopic Pregnancy |format= |work= |accessdate=}}</ref><ref>{{cite journal|last1=Rana|first1=P|last2=Kazmi|first2=I|last3=Singh|first3=R|last4=Afzal|first4=M|last5=Al-Abbasi|first5=FA|last6=Aseeri|first6=A|last7=Singh|first7=R|last8=Khan|first8=R|last9=Anwar|first9=F|title=Ectopic pregnancy: a review.|journal=Archives of gynecology and obstetrics|date=October 2013|volume=288|issue=4|pages=747–57|pmid=23793551|doi=10.1007/s00404-013-2929-2}}</ref> A previous induced [[abortion]] does not appear to increase the risk.<ref>{{cite book|title=Management of Unintended and Abnormal Pregnancy: Comprehensive Abortion Care|date=2011|publisher=John Wiley & Sons|isbn=9781444358476|url=https://books.google.ca/books?id=iK7xrRr2p9sC&pg=RA1-PT376|chapter=16 Answering questions about long term outcomes}}</ref> === Tube damage === Tubal pregnancy is when the egg is implanted in the [[Fallopian tube|Fallopian tubes]]. Hair-like [[cilia]] located on the internal surface of the Fallopian tubes carry the fertilized egg to the uterus. Fallopian cilia are sometimes seen in reduced numbers subsequent to an ectopic pregnancy, leading to a hypothesis that cilia damage in the Fallopian tubes is likely to lead to an ectopic pregnancy.<ref name="Lyons">{{cite journal | author = Lyons RA, Saridogan E, Djahanbakhch O | title = The reproductive significance of human Fallopian tube cilia | journal = Hum Reprod Update. | volume = 12 | issue = 4 | pages = 363–72 | year = 2006 | pmid = 16565155 | doi = 10.1093/humupd/dml012 }}</ref> Women who smoke have a higher chance of an ectopic pregnancy in the fallopian tubes. Smoking leads to risk factors of damaging and or killing cilia.<ref name="Lyons"/> As cilia degenerate the amount of time it takes for the fertilized egg to reach the uterus will increase. The fertilized egg, if it doesn't reach the uterus in time, will hatch from the non-adhesive zona pellucida and implant itself inside the fallopian tube, thus causing the pregnancy. Women with [[pelvic inflammatory disease]] (PID) have a high occurrence of ectopic pregnancy.<ref name="Tay">{{cite journal | author = Tay JI, Moore J, Walker JJ | title = Ectopic pregnancy | journal = West J Med. | volume = 173 | issue = 2 | pages = 131–4 | year = 2000 | pmid = 10924442 | pmc = 1071024 | doi = 10.1136/ewjm.173.2.131 }}</ref> This results from the build-up of [[scar|scar tissue]] in the Fallopian tubes, causing damage to cilia.<ref name=speroff/> If however both tubes were completely blocked, so that sperm and egg were physically unable to meet, then fertilization of the egg would naturally be impossible, and neither normal pregnancy nor ectopic pregnancy could occur. Intrauterine adhesions (IUA) present in [[Asherman's syndrome]] can cause ectopic cervical pregnancy or, if adhesions partially block access to the tubes via the [[Ostium of Fallopian tube|ostia]], ectopic tubal pregnancy.<ref name="Schenker">{{cite journal | author = Schenker JG, Margalioth EJ | title = Intra-uterine adhesions: an updated appraisal | journal = Fertility and Sterility | volume = 37 | issue = 5 | pages = 593–610. | year = 1982 | pmid = 6281085 | doi = }}</ref><ref name="Klyszejko">{{cite journal | author = Kłyszejko C, Bogucki J, Kłyszejko D, Ilnicki W, Donotek S, Koźma J | title = Cervical pregnancy in Asherman’s syndrome [article in Polish]. | journal = Ginekol Pol | volume = 58 | issue = 1 | pages = 46–8. | year = 1987 | pmid = 3583040 | doi = }}</ref><ref name="Dicker:">{{cite journal | author = Dicker D, Feldberg D, Samuel N, Goldman JA | title = Etiology of cervical pregnancy. Association with abortion, pelvic pathology, IUDs and Asherman's syndrome. | journal = J Reprod Med | volume = 30 | issue = 1 | pages = 25–7 | year = 1985 | pmid = 4038744 | doi = }}</ref> Asherman's syndrome usually occurs from intrauterine surgery, most commonly after [[Dilation and curettage|D&C]].<ref name="Schenker" /> Endometrial/pelvic/genital [[tuberculosis]], another cause of Asherman's syndrome, can also lead to ectopic pregnancy as infection may lead to tubal adhesions in addition to intrauterine adhesions.<ref name="Bukulmez">{{cite journal | author = Bukulmez O, Yarali H, Gurgan T | title = Total corporal synechiae due to tuberculosis carry a very poor prognosis following hysteroscopic synechialysis | journal = Human Reproduction | volume = 14 | issue = 8 | pages = 1960–1. | year = 1999 | pmid = 10438408 | doi = 10.1093/humrep/14.8.1960 }}</ref> [[Tubal ligation]] can predispose to ectopic pregnancy. Reversal of tubal sterilization ([[Tubal reversal]]) carries a risk for ectopic pregnancy. This is higher if more destructive methods of tubal ligation (tubal cautery, partial removal of the tubes) have been used than less destructive methods (tubal clipping). A history of a tubal pregnancy increases the risk of future occurrences to about 10%.<ref name=speroff/> This risk is not reduced by removing the affected tube, even if the other tube appears normal. The best method for diagnosing this is to do an early ultrasound. === Other === Although some investigations have shown that patients may be at higher risk for ectopic pregnancy with advancing age, it is believed that age is a variable which could act as a surrogate for other risk factors. Also, it has been noted that [[Tobacco smoking|smoking]] is associated with ectopic risk. Vaginal douching is thought by some to increase ectopic pregnancies.<ref name=speroff/> Women exposed to [[diethylstilbestrol]] (DES) in utero (also known as "DES daughters") also have an elevated risk of ectopic pregnancy.<ref name=Schrager2004>{{cite journal|author=Schrager S, Potter BE|title=Diethylstilbestrol exposure|journal=Am Fam Physician|volume=69|issue=10|pages=2395–400|date=May 2004|pmid=15168959|url=http://www.aafp.org/afp/2004/0515/p2395.html}}</ref> It has also been suggested that pathologic generation of [[nitric oxide]] through increased [[iNOS]] production may decrease [[tubal ciliary]] beats and smooth muscle contractions and thus affect embryo transport, which may consequently result in ectopic pregnancy.<ref>{{cite journal | author = Al-Azemi M, Refaat B, Amer S, Ola B, Chapman N, Ledger W | title = The expression of inducible nitric oxide synthase in the human fallopian tube during the menstrual cycle and in ectopic pregnancy | journal = Fertil. Steril. | volume = 94 | issue = 3 | pages = 833–840 | date = May 2009 | pmid = 19482272 | doi = 10.1016/j.fertnstert.2009.04.020 }}</ref> The low socioeconomic status may be risk factors for ectopic pregnancy.<ref name="pmid23726169">{{cite journal | author = Yuk JS, Kim YJ, Hur JY, Shin JH | title = Association between socioeconomic status and ectopic pregnancy rate in the Republic of Korea | journal = Int J Gynaecol Obstet | volume = 122 | issue = 2 | pages = 104–7 | year = 2013 | pmid = 23726169 | doi = 10.1016/j.ijgo.2013.03.015 }}</ref> == Diagnosis == An ectopic pregnancy should be considered as the cause of abdominal pain or vaginal bleeding in every woman who has a positive [[pregnancy test]].<ref name=Crochet2013/> The primary goal of diagnostic procedures in possible ectopic pregnancy is to [[triage]] according to risk rather than establishing pregnancy location.<ref name=kirk2013/> === Transvaginal ultrasonography === An [[ultrasound]] showing a [[gestational sac]] with fetal heart in the [[fallopian tube]] has a very high [[sensitivity and specificity|specificity]] of ectopic pregnancy. [[Transvaginal ultrasonography]] has a [[sensitivity and specificity|sensitivity]] of at least 90% for ectopic pregnancy.<ref name=kirk2013/> The diagnostic ultrasonographic finding in ectopic pregnancy is an adnexal mass that moves separately from the ovary. In around 60% of cases, it is an inhomogeneous or a noncystic adnexal mass sometimes known as the "blob sign". It is generally spherical, but a more tubular appearance may be seen in case of [[hematosalpinx]]. This sign has been estimated to have a sensitivity of 84% and specificity of 99% in diagnosing ectopic pregnancy.<ref name=kirk2013/> In the study estimating these values, the blob sign had a [[positive predictive value]] of 96% and a [[negative predictive value]] of 95%.<ref name=kirk2013/> The visualization of an empty extrauterine gestational sac is sometimes known as the "bagel sign", and is present in around 20% of cases.<ref name=kirk2013/> In another 20% of cases, there is visualization of a gestational sac containing a yolk sac and/or an embryo.<ref name=kirk2013/> Ectopic pregnancies where there is visualization of cardiac activity are sometimes termed "viable ectopic".<ref name=kirk2013/> <gallery mode=packed> File:Schematic figure of vaginal ultrasound in ectopic pregnancy.png|[[Transvaginal ultrasonography]] of an ectopic pregnancy, showing the field of view in the following image. File:Blob sign of ectopic pregnancy.png|A "blob sign", which consists of the ectopic pregnancy. The ovary is distinguished from it by having follicles, whereof one is visible in the field. This patient had an [[intrauterine device with progestogen|intrauterine device (IUD) with progestogen]], whose cross-section is visible in the field, leaving an ultrasound shadow distally to it. File:Ectopicleftmass.PNG|Ultrasound image showing an ectopic pregnancy where a [[gestational sac]] and fetus has been formed. </gallery> The combination of a positive pregnancy test and the presence of what appears to be a normal intrauterine pregnancy does not exclude an ectopic pregnancy, since there may be either a [[heterotopic pregnancy]] or a "{{visible anchor|pseudosac}}", which is a collection of within the endometrial cavity that may be seen in up to 20% of women.<ref name=kirk2013/> A small amount of [[anechogenic]] free fluid in the [[rectouterine pouch]] is commonly found in both intrauterine and ectopic pregnancies.<ref name=kirk2013/> The presence of [[echogenic]] fluid is estimated at between 28 and 56% of women with an ectopic pregnancy, and strongly indicates the presence of [[hemoperitoneum]].<ref name=kirk2013/> However, it does not necessarily result from tubal rupture, but is commonly a result from leakage from the [[distal tubal opening]].<ref name=kirk2013/> As a rule of thumb, the finding of free fluid is significant if it reaches the [[Fundus (uterus)|fundus]] or is present in the [[vesico-uterine pouch]].<ref name=kirk2013/> A further marker of serious intra-abdominal bleeding is the presence of fluid in the [[hepatorenal recess of the subhepatic space]].<ref name=kirk2013/> Currently, [[Doppler ultrasonography]] is not considered to significantly contribute to the diagnosis of ectopic pregnancy.<ref name=kirk2013/> A common misdiagnosis is of a normal intrauterine pregnancy is where the pregnancy is implanted laterally in an [[arcuate uterus]], potentially being misdiagnosed as an [[interstitial pregnancy]].<ref name=kirk2013/> === Ultrasonography and β-hCG === [[File:Algorithm in pregnancy of unknown location.svg|thumb|upright=1.4|[[Medical algorithm|Algorithm]] of the management of a pregnancy of unknown location, that is, a positive pregnancy test but no pregnancy is found on [[transvaginal ultrasonography]].<ref name=kirk2013/> If serum hCG at 0 hours is more than 1000 IU/L and there is no history suggestive of complete miscarriage, the ultrasonography should be repeated as soon as possible.<ref name=kirk2013/>]] Where no intrauterine pregnancy is seen on ultrasound, measuring [[β-human chorionic gonadotropin]] (β-hCG) levels may aid in the diagnosis. The rationale is that a low β-hCG level may indicate that the pregnancy is intrauterine but yet too small to be visible on ultrasonography. While some physicians consider that the threshold where an intrauterine pregnancy should be visible on transvaginal ultrasound is around 1500 IU/ml of β-hCG, a review in the JAMA Rational Clinical Examination Series showed that there is no single threshold for the β-human chorionic gonadotropin that confirms an ectopic pregnancy. Instead, the best test in a pregnant woman is a high resolution transvaginal ultrasound.<ref name=Crochet2013/> The presence of an adnexal mass in the absence of an intrauterine pregnancy on transvaginal sonography increases the likelihood of an ectopic pregnancy 100-fold (LR+ 111). When there are no adnexal abnormalities on transvaginal sonography, the likelihood of an ectopic pregnancy decreases (LR- 0.12). An empty uterus with levels higher than 1500 IU/ml may be evidence of an ectopic pregnancy, but may also be consistent with an intrauterine pregnancy which is simply too small to be seen on [[ultrasound]]. If the diagnosis is uncertain, it may be necessary to wait a few days and repeat the blood work. This can be done by measuring the β-hCG level approximately 48 hours later and repeating the ultrasound. The serum hCG ratios and [[logistic regression]] models appear to be better than absolute single serum hCG level.<ref>{{cite journal | author = van Mello NM, Mol F, Opmeer BC, Ankum WM, Barnhart K, Coomarasamy A, Mol BW, van der Veen F, Hajenius PJ | title = Diagnostic value of serum hCG on the outcome of pregnancy of unknown location: A systematic review and meta-analysis | journal = Human Reproduction Update | volume = 18 | issue = 6 | pages = 603–617 | year = 2012 | pmid = 22956411 | pmc = | doi = 10.1093/humupd/dms035 }}</ref> If the β-hCG falls on repeat examination, this strongly suggests a spontaneous abortion or rupture. The fall in serum hCG over 48 hours may be measured as the hCG ratio, which is calculated as:<ref name=kirk2013/> <math>hCG~ratio = \frac{hCG~at~48h}{hCG~at~0h}</math> An hCG ratio of 0.87, that is, a decrease in hCG of 13% over 48 hours, has a [[sensitivity and specificity|sensitivity]] of 93% and [[sensitivity and specificity|specificity]] of 97% for predicting a failing PUL.<ref name=kirk2013/> The majority of cases of ectopic pregnancy will have serial serum hCG levels that increase more slowly than would be expected with an IUP (that is, a ''suboptimal rise''), or decrease more slowly than would be expected with a failing PUL. However, up to 20% of cases of ectopic pregnancy have serum hCG doubling times similar to that of an IUP, and around 10% of EP cases have hCG patterns similar to a failing PUL.<ref name=kirk2013/> === Other diagnostic methods === A [[laparoscopy]] or [[laparotomy]] can also be performed to visually confirm an ectopic pregnancy. This is generally reserved for women presenting with signs of an [[acute abdomen]] and/or [[hypovolemic shock]].<ref name="kirk2013"/> Often if a tubal abortion or tubal rupture has occurred, it is difficult to find the pregnancy tissue. A laparoscopy in very early ectopic pregnancy rarely shows a normal looking [[fallopian tube]]. [[Culdocentesis]], in which fluid is retrieved from the space separating the vagina and rectum, is a less commonly performed test that may be used to look for internal bleeding. In this test, a needle is inserted into the space at the very top of the vagina, behind the uterus and in front of the rectum. Any blood or fluid found may have been derived from a ruptured ectopic pregnancy. [[Progesterone]] levels of less than 20 nmol/l have a high [[predictive value]] for failing pregnancies, whilst levels over 25 nmol/l are likely to predict viable pregnancies, and levels over 60 nmol/l are strongly so. This may help in identifying failing PULs that are at low risk and thereby needing less follow-up.<ref name=kirk2013/> [[Inhibin A]] may also be useful for predicting spontaneous resolution of PUL, but is not as good as progesterone for this purpose.<ref name=kirk2013/> In addition, there are various mathematical models, such as logistic regression models and Bayesian networks, for the prediction of PUL outcome based on multiple parameters.<ref name=kirk2013/> Mathematical models also aim to identify PULs that are ''low risk'', that is, failing PULs and IUPs.<ref name=kirk2013/> [[Dilation and curettage]] is sometimes used to diagnose pregnancy location with the aim of differentiating between an EP and a non-viable IUP in situations where a viable IUP can be ruled out. Specific indications for this procedure include either of the following:<ref name=kirk2013/> * no visible IUP on transvaginal ultrasonography with a serum hCG of more than 2000 IU/ml * an abnormal rise in hCG level. A rise of 35% over 48 hours is proposed as the minimal rise consistent with a viable intrauterine pregnancy. * an abnormal fall in hCG level, such as defined as one of less than 20% in 2 days === Classification === ==== Tubal pregnancy ==== The vast majority of ectopic pregnancies implant in the Fallopian tube. Pregnancies can grow in the fimabrial end (5% of all ectopic pregnancies), the ampullary section (80%), the isthmus (12%), and the cornual and interstitial part of the tube (2%).<ref name=speroff>{{cite book| author=Speroff L, Glass RH, Kase NG |title=Clinical Gynecological Endocrinology and Infertility, 6th Ed. |publisher=Lippincott Williams & Wilkins (1999) |page=1149ff |isbn=0-683-30379-1}}</ref> Mortality of a tubal pregnancy at the isthmus or within the uterus ([[interstitial pregnancy]]) is higher as there is increased vascularity that may result more likely in sudden major internal bleeding. A review published in 2010 supports the hypothesis that tubal ectopic pregnancy is caused by a combination of retention of the embryo within the fallopian tube due to impaired embryo-tubal transport and alterations in the tubal environment allowing early implantation to occur.<ref>{{cite journal | author = Shaw JL, Dey SK, Critchley HO, Horne AW | title = Current knowledge of the aetiology of human tubal ectopic pregnancy | journal = Hum Reprod Update | volume = 16 | issue = 4 | pages = 432–44 | date = January 2010 | pmid = 20071358 | pmc = 2880914 | doi = 10.1093/humupd/dmp057 | url = }}</ref> ==== Nontubal ectopic pregnancy ==== Two percent of ectopic pregnancies occur in the ovary, cervix, or are intraabdominal. Transvaginal [[ultrasound]] examination is usually able to detect a [[cervical pregnancy]]. An [[ovarian pregnancy]] is differentiated from a tubal pregnancy by the [[Spiegelberg criteria]].<ref>{{WhoNamedIt|synd|2274|Spiegelberg's criteria}}</ref> While a fetus of ectopic pregnancy is typically not viable, very rarely, a live baby has been delivered from an [[abdominal pregnancy]]. In such a situation the [[placenta]] sits on the intraabdominal organs or the [[peritoneum]] and has found sufficient blood supply. This is generally bowel or mesentery, but other sites, such as the renal (kidney), liver or hepatic (liver) artery or even aorta have been described. Support to near viability has occasionally been described, but even in third world countries, the diagnosis is most commonly made at 16 to 20 weeks gestation. Such a fetus would have to be delivered by [[laparotomy]]. Maternal morbidity and mortality from extrauterine pregnancy are high as attempts to remove the placenta from the organs to which it is attached usually lead to uncontrollable bleeding from the attachment site. If the organ to which the placenta is attached is removable, such as a section of bowel, then the placenta should be removed together with that organ. This is such a rare occurrence that true data are unavailable and reliance must be made on anecdotal reports.<ref>{{cite news | title='Special' baby grew outside womb | url=http://news.bbc.co.uk/1/hi/england/beds/bucks/herts/4197194.stm | date=2005-08-30 | publisher=BBC News | accessdate=2006-07-14}}</ref><ref>{{cite news | title=Bowel baby born safely | url=http://news.bbc.co.uk/2/hi/health/671390.stm | date=2005-03-09 |publisher=BBC News | accessdate=2006-11-10}}</ref><ref name="pmid17957101">{{cite journal | author = Zhang J, Li F, Sheng Q | title = Full-term abdominal pregnancy: a case report and review of the literature | journal = Gynecol. Obstet. Invest. | volume = 65 | issue = 2 | pages = 139–41 | year = 2008 | pmid = 17957101 | doi = 10.1159/000110015 | url = | issn = }}</ref> However, the vast majority of abdominal pregnancies require intervention well before [[fetal viability]] because of the risk of bleeding. ==== Heterotopic pregnancy ==== In rare cases of ectopic pregnancy, there may be two fertilized eggs, one outside the uterus and the other inside. This is called a [[heterotopic pregnancy]].<ref name=Crochet2013/> Often the intrauterine pregnancy is discovered later than the ectopic, mainly because of the painful emergency nature of ectopic pregnancies. Since ectopic pregnancies are normally discovered and removed very early in the pregnancy, an ultrasound may not find the additional pregnancy inside the uterus. When hCG levels continue to rise after the removal of the ectopic pregnancy, there is the chance that a pregnancy inside the uterus is still viable. This is normally discovered through an ultrasound. Although rare, heterotopic pregnancies are becoming more common, likely due to increased use of IVF. The survival rate of the uterine fetus of an ectopic pregnancy is around 70%.<ref>{{cite journal | author = Lau S, Tulandi T | title = Conservative medical and surgical management of interstitial ectopic pregnancy | journal = Fertility and Sterility | volume = 72 | issue = 2 | pages = 207–15 | year = 1999 | pmid = 10438980 | doi=10.1016/s0015-0282(99)00242-3}}</ref> ==== Persistent ectopic pregnancy ==== A persistent ectopic pregnancy refers to the continuation of trophoblastic growth after a surgical intervention to remove an ectopic pregnancy. After a conservative procedure that attempts to preserve the affected fallopian tube such as a [[salpingotomy]], in about 15-20% the major portion of the ectopic growth may have been removed, but some trophoblastic tissue, perhaps deeply embedded, has escaped removal and continues to grow, generating a new rise in hCG levels.<ref>{{cite journal| doi=10.1016/S1074-3804(05)80774-1| author=Kemmann E, Trout S, Garcia A |title=Can we predict patients at risk for persistent ectopic pregnancy after laparoscopic salpingotomy?| journal=The Journal of the American Association of Gynecologic Laparoscopists | volume=1 |issue=2 |date=February 1994| pages=122–126 |url=http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B7W6G-4KFTB5B-6&_user=10&_coverDate=02%2F28%2F1994&_rdoc=1&_fmt=high&_orig=article&_cdi=28550&_sort=v&_docanchor=&view=c&_ct=432&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=ebbee42acb01b64a9d7df19cba0ab1c0|accessdate=January 22, 2010| pmid=9050473}}</ref> After weeks this may lead to new clinical symptoms including bleeding. For this reason hCG levels may have to be monitored after removal of an ectopic pregnancy to assure their decline, also [[methotrexate]] can be given at the time of surgery prophylactically. ==== Pregnancy of unknown location ==== Pregnancy of unknown location (PUL) is the term used for a pregnancy where there is a positive pregnancy test but no pregnancy has been visualized using [[transvaginal ultrasonography]].<ref name=kirk2013/> Specialized early pregnancy departments have estimated that between 8 and 10% of women attending for an ultrasound assessment in early pregnancy will be classified as having a PUL.<ref name=kirk2013/> The true nature of the pregnancy can be an ongoing viable intrauterine pregnancy, a failed pregnancy, an ectopic pregnancy or rarely a [[#Persisting PUL|persisting PUL]].<ref name=kirk2013/> Because of frequent ambiguity on ultrasonography examinations, the following classification is proposed:<ref name=kirk2013/> {| class="wikitable" ! Condition !! Criteria |- | Definite ectopic pregnancy || Extrauterine [[gestational sac]] with yolk sac and/or embryo (with or without cardiac activity). |- | Pregnancy of unknown location - probable ectopic pregnancy || Inhomogeneous adnexal mass or extrauterine sac-like structure. |- | "True" pregnancy of unknown location || No signs of neither an intrauterine nor extrauterine pregnancy on transvaginal ultrasonography. |- | Pregnancy of unknown location - probable intrauterine pregnancy || Intrauterine gestational sac-like structure. |- | Definite intrauterine pregnancy || Intrauterine gestational sac with yolk sac and/or embryo (with or without cardiac activity). |} In women with a pregnancy of unknown location, between 6% and 20% have an ectopic pregnancy.<ref name=kirk2013/> In cases of pregnancy of unknown location and a history of heavy bleeding, is has been estimated that approximately 6% have an underlying ectopic pregnancy.<ref name=kirk2013/> Between 30 and 47% of women with pregnancy of unknown location are ultimately diagnosed with an ongoing intrauterine pregnancy, whereof the majority (50 –70%) will be found to have failing pregnancies where the location is never confirmed.<ref name=kirk2013/> {{visible anchor|Persisting PUL}} is where the hCG level does not spontaneously decline and no intrauterine or ectopic pregnancy is identified on follow-up transvaginal ultrasonography.<ref name=kirk2013/> A persisting PUL is likely either a small ectopic pregnancy that has not been visualized, or a retained trophoblast in the endometrial cavity.<ref name=kirk2013/> Treatment should only be considered when a potentially viable intrauterine pregnancy has been definitively excluded.<ref name=kirk2013/> A ''treated persistent PUL'' is defined as one managed medically (generally with methotrexate) without confirmation of the location of the pregnancy such as by ultrasound, laparoscopy or uterine evacuation.<ref name=kirk2013/> A ''resolved persistent PUL'' is defined as serum hCG reaching a non-pregnant value (generally less than 5 IU/l) after expectant management, or after uterine evacuation without evidence of chorionic villi on [[histopathological examination]].<ref name=kirk2013/> In contrast, a relatively low and unresolving level of serum hCG indicates the possibility of an hCG-secreting tumour.<ref name=kirk2013/> === Differential diagnosis === Other conditions that cause similar symptoms include: [[miscarriage]], [[ovarian torsion]], and [[acute appendicitis]], ruptured ovarian cyst, [[kidney stone]], and pelvic inflammatory disease, among others.<ref name=Crochet2013/> == Treatment == === Expectant management === Most women with a PUL are followed up with serum hCG measurements and repeat [[transvaginal ultrasonography|TVS]] examinations until a final diagnosis is confirmed.<ref name=kirk2013/> Low-risk cases of PUL that appear to be failing pregnancies may be followed up with a urinary pregnancy test after 2 weeks and get subsequent telephone advice.<ref name=kirk2013/> Low-risk cases of PUL that are likely intrauterine pregnancies may have another TVS in 2 weeks to access viability.<ref name=kirk2013/> High-risk cases of PUL require further assessment, either with a TVS within 48 h or additional hCG measurement.<ref name=kirk2013/> === Medical === Early treatment of an ectopic pregnancy with [[methotrexate]] is a viable alternative to surgical treatment<ref name="pmid17591007">{{cite journal | author = Mahboob U, Mazhar SB | title = Management of ectopic pregnancy: a two-year study | journal = Journal of Ayub Medical College, Abbottabad: JAMC | volume = 18 | issue = 4 | pages = 34–7 | year = 2006 | pmid = 17591007 | doi = }}</ref> which was developed in the 1980s.<ref>[http://www.ectopicpregnancy.co.uk/for-professionals/perspectives/history-and-diagnosis/ "History, Diagnosis and Management of Ectopic Pregnancy"]</ref> If administered early in the pregnancy, methotrexate terminates the growth of the developing embryo; this may cause an [[abortion]], or the developing embryo may then be either resorbed by the woman's body or pass with a [[menstrual period]]. Contraindications include liver, kidney, or blood disease, as well as an ectopic embryonic mass > 3.5&nbsp;cm. Also, it may lead to the inadvertent termination of an undetected intrauterine pregnancy, or severe abnormality in any surviving pregnancy.<ref name=kirk2013/> Therefore, it is recommended that methotrexate should only be administered when [[human chorionic gonadotrophin|hCG]] has been serially monitored with a rise less than 35% over 48 hours, which practically excludes a viable intrauterine pregnancy.<ref name=kirk2013/> === Surgical === [[File:Ectopic pregnancy1981.jpg|thumb|Surgical treatment: Laparoscopic view of an ectopics pregnancy located in the left Fallopian tube, hematosalpinx is present on the left, the right tube is of normal appearance]] [[File:salpingectomy1981.jpg|thumb|The left Fallopian tube containing the ectopic pregnancy has been removed (salpingectomy).]] If bleeding has already occurred, surgical intervention may be necessary. However, whether to pursue surgical intervention is an often difficult decision in a stable patient with minimal evidence of blood clot on ultrasound.{{Citation needed|date=December 2009}} Surgeons use [[laparoscopy]] or [[laparotomy]] to gain access to the pelvis and can either incise the affected Fallopian and remove only the pregnancy ([[salpingostomy]]) or remove the affected tube with the pregnancy ([[salpingectomy]]). The first successful surgery for an ectopic pregnancy was performed by [[Robert Lawson Tait]] in 1883.<ref>{{cite web |url=http://www.emedicine.com/med/byname/Surgical-Management-of-Ectopic-Pregnancy.htm |title=eMedicine - Surgical Management of Ectopic Pregnancy: Article Excerpt by R Daniel Braun |accessdate=2007-09-17 |work=}}</ref> It is estimated that an acceptable rate of PULs that eventually undergo surgery is between 0.5 and 11%.<ref name=kirk2013/> [[Autotransfusion]] of a woman's own blood as drained during surgery may be useful in those who have a lot of bleeding into their abdomen.<ref>{{cite journal|last1=Selo-Ojeme|first1=DO|last2=Onwude|first2=JL|last3=Onwudiegwu|first3=U|title=Autotransfusion for ruptured ectopic pregnancy.|journal=International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics|date=February 2003|volume=80|issue=2|pages=103–10|pmid=12566181|doi=10.1016/s0020-7292(02)00379-x}}</ref> Published reports that a re-implanted embryo survived to birth were debunked as false.<ref>{{cite journal|last1=Smith|first1=R|title=Research misconduct: the poisoning of the well.|journal=Journal of the Royal Society of Medicine|date=May 2006|volume=99|issue=5|pages=232–7|pmid=16672756|doi=10.1258/jrsm.99.5.232}}</ref> == Complications == [[File:FluidMorisonsPouchEctop.PNG|thumb|Blood in [[Morrison's pouch]] between the liver and kidney due to a ruptured ectopic pregnancy]] The most common complication is rupture with internal bleeding which may lead to hypovolemic shock. Death from rupture is still the leading cause of death in the first trimester of the pregnancy.{{Citation needed|date=December 2009}} == Prognosis == When ectopic pregnancies are treated, the prognosis for the mother is very good in Western countries; maternal death is rare, but most fetuses die or are aborted. For instance, in the UK, between 2003 and 2005 there were 32,100 ectopic pregnancies resulting in 10 maternal deaths (meaning that 1 in 3,210 women with an ectopic pregnancy died).<ref>http://patient.info/doctor/ectopic-pregnancy-pro</ref> In the developing world, however, especially in [[Africa]], the death rate is very high, and ectopic pregnancies are a major cause of death among women of childbearing age. === Future fertility === Fertility following ectopic pregnancy depends upon several factors, the most important of which is a prior history of [[infertility]].<ref name="isbn0-8247-0844-X">{{cite book |author=Togas Tulandi; Tan, S. L; Tan, Seang Lin; Tulandi, T. |title=Advances in Reproductive Endocrinology and Infertility: Current Trends and Developments |publisher=Informa Healthcare |location= |year=2002 |pages=240 |isbn=0-8247-0844-X |oclc= |doi= |accessdate=2009-12-21}}</ref> The treatment choice does not play a major role; A randomized study in 2013 concluded that the rates of intrauterine pregnancy 2 years after treatment of ectopic pregnancy are approximately 64% with radical surgery, 67% with medication, and 70% with conservative surgery.<ref>{{cite journal | author = Fernandez H, Capmas P, Lucot JP, Resch B, Panel P, Bouyer J | title = Fertility after ectopic pregnancy: The DEMETER randomized trial | journal = Human Reproduction | volume = 28 | issue = 5 | pages = 1247–1253 | year = 2013 | pmid = 23482340 | pmc = | doi = 10.1093/humrep/det037 }}</ref> In comparison, the cumulative pregnancy rate of women under 40 years of age in the general population over 2 years is over 90%.<ref name=nice2013>[http://guidance.nice.org.uk/CG156 Fertility: assessment and treatment for people with fertility problems]. [[NICE guidelines|NICE clinical guideline]] CG156 - Issued: February 2013</ref> == Epidemiology == [[File:Tubal Pregnancy with embryo.jpg|thumb|An opened oviduct with an ectopic pregnancy at about 7 weeks gestational age.]] The rate of ectopic pregnancy is about 1 and 2% of that of live births in developed countries, though it is as high as 4% in pregnancies involving [[assisted reproductive technology]].<ref name=kirk2013/> Between 93 and 97% of ectopic pregnancies are located in a [[Fallopian tube]].<ref name=Crochet2013/> Of these, in turn, 13% are located in the [[isthmus of uterine tube|isthmus]], 75% are located in the [[Ampulla of uterine tube|ampulla]], and 12% in the [[Fimbriae of uterine tube|fimbriae]].<ref name=kirk2013/> Ectopic pregnancy is responsible for 6% of maternal deaths during the first trimester of pregnancy making it the leading cause of maternal death during this stage of pregnancy.<ref name=Crochet2013/> Between 5% and 42% of women seen for ultrasound assessment with a positive pregnancy test have a ''pregnancy of unknown location'' (PUL), that is a positive pregnancy test but no pregnancy visualized at [[transvaginal ultrasonography]].<ref name=kirk2013/> Between 6 and 20% of PUL are subsequently diagnosed with actual ectopic pregnancy.<ref name=kirk2013/> == Society and culture == Salpingectomy as a treatment for ectopic pregnancy is one of the common cases when the [[Principle of double effect#Medicine|principle of double effect can be used]] to justify accelerating the death of the embryo by doctors and patients opposed to outright abortions.<ref name="How does the principle of double-effect relate to ectopic pregnancies?">{{cite web|last1=Delgado|first1=George|title=Pro-Life Open Forum, Apr 10, 2013 (49min40s)|url=http://www.catholic.com/audio-player/8236|website=Catholic answers|accessdate=2 September 2014}}</ref> In the Catholic church, there are moral debates on certain treatments being licit or illicit. Salpingectomy, which involves the removing of the section where the embryo implanted in the fallopian tube is considered licit. However, salpingostomy, where only the embryo itself is removed, leaving the fallopian tube intact is considered illicit. This is because it is understood that salpingostomy is a direct attack on the embryo, which would end its life. The same can be said for the drug therapy methotrexate, which also attacks the growth and development of the embryo.<ref>http://www.ncbcenter.org/Page.aspx?pid=940</ref><ref>Marie A. Anderson, Robert L. Fastiggi, David E. Hargroder, Rev. Joseph C. Howard Jr., and C. Ward Kischer.''Ectopic Pregnancy and Catholic Morality.'' 2011</ref> Both attacks on the embryo are forms of abortion, thus they go against Catholic beliefs regarding life of the embryo. == Live birth == There have been cases where ectopic pregnancy lasted many months and ended in a live baby delivered by [[laparotomy]]. In July 1999, [[Lori Dalton]] gave birth by [[Cesarean section]] in [[Ogden, Utah|Ogden]], [[Utah]], [[USA]], to a healthy baby girl who had developed outside of the [[uterus]]. Previous ultrasounds had not discovered the problem. "[Sage Dalton]'s delivery was slated as a routine Cesarean birth at Ogden Regional Medical Center in Utah. When Dr. Naisbitt performed Lori’s Cesarean, he was astonished to find Sage within the amniotic membrane outside the womb […]."<ref>{{cite news |title=Registry Reports | date=October 1999| publisher=ARDMS The Ultrasound Choice | url =http://www.ardms.org/downloads/RegistryReports/Sep99.pdf| work =Volume XVI, Number 5 | pages = | accessdate = 2011-06-22 | location=Ogden, Utah}}</ref> "But what makes this case so rare is that not only did mother and baby survive — they're both in perfect health. John Dalton [(the father)] took home video inside the delivery room. Sage came out doing extremely well because even though she had been implanted outside the womb, a rich blood supply from a [[uterine fibroid]] along the outer uterus wall had nourished her with a rich source of blood."<ref>{{cite news |title=Miracle baby | date=1999-08-05| publisher=Utah News from KSL-TV | url =http://web.ksl.com/dump/news/cc/special/science/ectopic.htm| work = | pages = | accessdate = 2011-06-22 | location=Ogden, Utah}}</ref> On 19 April 2008 an [[england|English]] woman, Jayne Jones (age 37) who had an ectopic pregnancy attached to the [[Greater omentum|omentum]], the fatty covering of her [[large bowel]], gave birth to her son Billy by a [[laparotomy]] at 28 weeks [[gestation]]. The [[surgery]], the first of its kind to be performed in the [[UK]], was successful, and both mother and baby survived.<ref>{{cite news |title=Miracle baby Billy grew outside his mother's womb | date=2008-08-31| publisher=Daily Mail | url =http://www.dailymail.co.uk/femail/article-1050942/Miracle-baby-Billy-grew-outside-mothers-womb.html| work = | pages = | accessdate = 2008-09-03 | language = | location=London | first=Laura | last=Collins}}</ref> On May 29, 2008 an [[Australia]]n woman, Meera Thangarajah (age 34), who had an ectopic pregnancy in the [[ovary]], gave birth to a healthy full term 6 pound 3 ounce (2.8&nbsp;kg) baby girl, Durga, via [[Cesarean section]]. She had no problems or complications during the 38‑week pregnancy.<ref>{{cite news|title=Baby Born After Rare Ovarian Pregnancy |date=2008-05-30 |publisher=[[Associated Press]] |url=http://ap.google.com/article/ALeqM5h7An_4HQLG6rSVO-h1eBIntgYOyAD90VRLKO1 |work= |pages= |accessdate=2008-05-30 |language= |deadurl=yes |archiveurl=https://web.archive.org/20080603100609/http://ap.google.com:80/article/ALeqM5h7An_4HQLG6rSVO-h1eBIntgYOyAD90VRLKO1 |archivedate=June 3, 2008 }}</ref><ref>{{cite news | first=Rebekah | last=Cavanagh | title=Miracle baby may be a world first | date=2008-05-30 | publisher= | url =http://www.news.com.au/story/0,23599,23782145-2,00.html | work = | pages = | accessdate = 2008-05-30 | language = }}</ref> In September 1999 an [[england|English]] woman, Jane Ingram (age 32) gave birth to triplets: Olivia, Mary and Ronan, with an extrauterine fetus (Ronan) below the womb and [[twins]] in the womb. All three survived. The twins in the womb were taken out first.<ref>{{cite news |title=Doctors hail 'miracle' baby |date=2009-09-10 |newspaper=BBC News |url=http://news.bbc.co.uk/1/hi/health/443373.stm |accessdate=}}</ref> == Other animals == Ectopic gestation exists in [[mammal]]s other than humans. In [[sheep]], it can go to term, with [[Mammary gland|mammary]] preparation to [[parturition]], and [[childbirth|expulsion efforts]]. The fetus can be removed by [[cesarian section]]. Pictures of cesarian section of a euthanized [[domestic sheep|ewe]], 5 days after parturition signs. <gallery> File:Poirtêye foû matrice pate.JPG|Leg of fetal lamb appearing out of the uterus during cesarian section. File:Poirtêye foû matrice saetch1.JPG|External view of fetal sac, necrotic distal part. File:Poirtêye foû matrice saetch2.JPG|Internal view of fetal sac, before resection of distal necrotic part. File:Poirtêye foû matrice saetch3.JPG|Internal view of fetal sac, the necrotic distal part is to the left. File:Poirtêye foû matrice saetch&coine.JPG|External side of fetal sac, proximal end, with ovary and uterine horn. File:Poirtêye foû matrice saetch ådfoû pwels.JPG|Resected distal part of fetal sac, with attached placenta. </gallery> == References == {{reflist|32em}} == External links == {{commons category|Ectopic pregnancy}} * [http://www.claripacs.com/case/CL0019 CT of the abdomen showing abdominal ectopic pregnancy] * [http://www.ectopic.org.uk The Ectopic Pregnancy Trust] - Information and support for those who have suffered the condition by a medically overseen and moderated [[united Kingdom|UK]] based charity, recognised by the National Health Service (UK) Department of Health (UK) and [http://www.rcog.org.uk/ the Royal College of Obstetricians and Gynaecologists] * [http://www.ectopic.org.uk Brown discharge first trimester] - Information and support for pregnant women {{Pathology of pregnancy, childbirth and the puerperium}} {{Authority control}} [[Category:Medical emergencies]] [[Category:Pregnancy with abortive outcome]] [[Category:Health issues in pregnancy]] [[Category:RTT]]'