Dichorionic diamniotic twins (DCDA: two placentas, two amniotic sacs) account for approximately 80% of all twins and this includes 10% of twins resulting ...PrintPDFNavigationTop...IntroductionTypesofTwinsDefinedByTypeofPlacentationAndAmnionicityModeAndTimeofDeliveryFirstStageofLaborSecondStageofLabor:DeliveryThirdStageofLaborCesareanSectionForTwinsPracticeRecommendationsReferencesStudyAssessment–OptionalYourFeedbackThischaptershouldbecitedasfollows:LemmonB,PereiraS,Glob.libr.women'smed.,ISSN:1756-2228;DOI10.3843/GLOWM.414003TheContinuousTextbookofWomen’sMedicineSeries–ObstetricsModuleVolume11LaboranddeliveryVolumeEditor:DrEdwinChandraharan,DirectorGlobalAcademyofMedicalEducationandTraining,London,UKChapterDeliveryofTwinsFirstpublished:February2021AUTHORSBernadetteLemmon,BM,BchRegistrarinObstetricsandGynaecology,KingstonHospitalNHSFoundationTrust,KingstonuponThames,UKSusanaPereira,MDConsultantObstetricianandSub-specialistinMaternal-FetalMedicineKingstonHospitalNHSFoundationTrust,KingstonuponThames,UKStudyAssessmentOptionBycompleting4multiple-choicequestions(randomlyselected)afterstudyingthischapterreaderscanqualifyforContinuingProfessionalDevelopmentawardsfromFIGOplusaStudyCompletionCertificatefromGLOWMSeeendofchapterfordetailsINTRODUCTIONWorldwide2–3%ofalllivebirthsaremultiples,1themajorityofthese(97%)beingtwins.2Theincidenceoftwinpregnanciesisincreasingduetotheuseoffertilitydrugsandadvancingmaternalageattimeofpregnancyobservedinwell-resourcedcountries.Itisknownthatwithamaternalageofover35thereisanincreasedrateoftwinning,3andupto24%ofsuccessfulIVFcyclesendinamultiplepregnancy.1Thisissignificantasbothmaternalandperinatalmortalityandmorbidityishigherintwincomparedtosingletonpregnancies4(Tables1and2).Twinpregnanciesaremorelikelytobecomplicatedandsorequiremoreintensiveantenatalmonitoringaswellasspecializedintrapartumcare.Ideallythecareofatwinpregnancyshouldbebyamultidisciplinaryteamwithexperienceofthesepregnancies.Thischapterfocusesonrecommendationsforthecareofwomenwit

dichorionic diamniotic (DCDA) twins – each has their own separate placenta with its own separate inner membrane (amnion) and outer membrane (chorion) ...SkiptomaincontentHomePregnancyYourpregnancycareBacktoYourpregnancycareAntenatalcarewithtwinsWhenyou'reexpectingtwinsortriplets,it'simportantthatyouattendallyourappointmentsbecauseoftheincreasedriskswiththistypeofpregnancy.Yourantenatalteamshouldbeexperiencedincaringforwomenhavingtwinsortriplets.Check-upsandscansinatwinpregnancyThenumberoftestsandscansyou'llbeofferedwilldependonthetypeoftwinsortripletsyou'rehaving.Womenwithmultiplepregnanciesshouldbeofferedanultrasoundscanataround11to14weeks.It'simportanttoattendthisappointment.Thisisthebesttimetofindoutwhattypeofplacentaandmembranesyourtwinshave(chorionicity)andcheckyourdates.YoucanalsohaveanuchaltranslucencytestforDown'ssyndromedoneatthesametimeifyouwish.FindoutmoreaboutscreeningforDown'ssyndromeYou'llalsobeofferedascan,calledananomalyscan,around18to20weeks6daystocheckthatyourbabiesaredevelopingnormally.DifferenttypesoftwinsFormedicalpurposes,thereare3typesoftwins.Theseapplytotripletstoo,althoughatripletpregnancywillbemorecomplexthanatwinone.The3typesare:dichorionicdiamniotic(DCDA)twins–eachhastheirownseparateplacentawithitsownseparateinnermembrane(amnion)andoutermembrane(chorion)monochorionicdiamniotic(MCDA)twins–shareasingleplacentawithasingleoutermembraneand2innermembranesmonochorionicmonoamniotic(MCMA)twins–shareboththeinnerandoutermembranesAllnon-identicaltwinsareDCDA,andathirdofidenticaltwinsareDCDA.Theothertwo-thirdsofidenticaltwinsareMCDA,andjust1in100identicaltwinsareMCMA.Thepercentagesofidenticalandnon-identicaltwinsbornintheUKarenotroutinelyrecorded,butaccordingtotheMultipleBirthsFoundationaboutathirdoftwinsareidentical.WhatextracaremayIneed?IfyourbabiesareMCDA,youcanexpectmorescansandmonitoring,asthistypeoftwinshasthehighestriskoftwin-twintransfusionsyndrome(TTTS),whichis anabnormalityoftheplacenta.Youmaybereferredtoaregionalcentreforfoetalmedicinetobes

A dichorionic diamniotic (DCDA) twin pregnancy is a type of twin pregnancy where each twin has its own chorionic and amniotic sacs. This type occurs most ...×ArticlesLogInCasesSignUpCoursesQuizDonateAbout×MenuSearchADVERTISEMENT:Radiopaediaisfreethankstooursupportersandadvertisers.BecomeaGoldSupporterandseenoads.ArticlesCasesCoursesLogInLoginSignup{"url":"/signup-modal-props.json?lang=us\u0026email="}ArticlesCasesCoursesQuizAboutRecentEditsGoad-freeSearchDichorionicdiamniotictwinpregnancyDrYurangaWeerakkody◉andRadswiki◉etal.Adichorionicdiamniotic(DCDA) twinpregnancyisatypeoftwinpregnancywhereeachtwinhasitsownchorionicandamnioticsacs.Thistypeoccursmostcommonlywithdizygotic twins,butmayalsooccurwithmonozygotic twinpregnancies.Thistypeofpregnancymayhavecharacteristicfindingsonultrasound.Onthispage:Article:EpidemiologyPathologyRadiographicfeaturesComplicationsRelatedarticlesReferencesImages:CasesandfiguresEpidemiologyDCDApregnanciesaccountforthemajority(~76%)ofalltwinpregnancies.Theyaccountforalldizygoticpregnanciesand~20%ofmonozygoticpregnancies.PathologyEtiologyWithadizygoticpregnancy,twoovaareindependentlyfertilisedbytwospermleadingtotwozygotes. Withamonozygotictwinpregnancy,DCDApregnancyresultsfromtheseparationofthezygotesat~1-4dayspostfertilisation(morula)stage. RadiographicfeaturesUltrasoundSonographicassessmentofchorionicityismostaccurateinthefirsttrimester.FirsttrimesterFeaturessupportingaDCDApregnancy:presenceoftwogestationalsacswithathickechogenicchorionsurroundingeachembryoathickinter-twinmembrane (oftentakenas> 2mm)twinpeaksign (lambda(λ) sign)twoyolksacsmaybeseen(this,however,doesnotdifferentiateaDCDApregnancyfromamonochorionicdiamniotic(MCDA) pregnancy)Secondtrimesterwhenthereisnoplacentalfusion,twoseparateplacentalsitesmaybeseen4afindingoftwodifferentgendersforeachtwinisadefinitivefeatureforadizygoticpregnancywhichinturnwillinvariablymeanaDCDApregnancyIfthetwinsareofthesamegenderthenitisextremelydifficultifnotimpossibletodetermineiftheyaremonozygoticordiz

Almost one third of identical twins have their own placenta, inner membrane, and outer membrane. The medical term for these twins is 'dichorionic diamniotic' or ...PRINTSHAREshareviaFacebookshareviaTwittershareviaEmailThereisatotalof5errorsonthisform,detailsarebelow.PleaseenteryournamePleaseenteryouremailYouremailisinvalid.PleasecheckandtryagainPleaseenterrecipient'semailRecipient'semailisinvalid.PleasecheckandtryagainAgreetoTermsrequiredThankyouforsharingourcontent.Amessagehasbeensenttoyourrecipient'semailaddresswithalinktothecontentwebpage.Yourname:isrequiredError:ThisisrequiredYouremail:isrequiredError:ThisisrequiredError:NotavalidvalueSendto:isrequiredError:ThisisrequiredError:NotavalidvalueError:ThisisrequiredIhavereadandagreetotheTermsofUseandPrivacyPolicyisrequired.Therearetwotypesoftwins-fraternaltwinsandidenticaltwins.Findoutmoreaboutthedifferencebetweenthetwotypesandtwin-twintransfusionsyndrome.FraternaltwinsFraternaltwinsareformedfromthefertilisationoftwoeggsbytwodifferentsperm.Theyarealsoknownas'dizygotictwins',or'non-identicaltwins'.Withfraternaltwins,thetwofoetuses(developingbabies)eachhaveaseparateplacenta,innermembrane(theamnion)andoutermembrane(thechorion).Theydon'tusuallylookidenticalandmightormightnotbethesamesex.IdenticaltwinsIdenticaltwinsareformedfromthesplittingofoneembryo.Theyarealsoknownas'monozygotictwins'.Therearedifferenttypesofidenticaltwins,dependingonwhattheyshareinthewomb.Almostonethirdofidenticaltwinshavetheirownplacenta,innermembrane,andoutermembrane.Themedicaltermforthesetwinsis‘dichorionicdiamniotic’orDCDAtwins.Almosttwo-thirdsofidenticaltwinssharethesameplacentaandchorion,buthavetheirownamnion.Theseare‘monochorionicdiamniotic’orMCDAtwins.Therest—onlyabout4%ofidenticaltwins—shareeverything,andarecalled‘monochorionicmonoamniotic’(MCMA)twins.Althoughidenticaltwinsarethesamesexandaregeneticallyidentical,theycandevelopquitedifferentpersonalities.Youcanfindagooddescriptionofthedifferenttypesofmonozygotictwins,withpictures,attheTwinsRes