As with singleton pregnancies, fetal anomaly scans are recommended at 18–20+6 weeks to identify structural anomalies in twin pregnancies. The ...NCBISkiptomaincontentSkiptonavigationResourcesHowToAboutNCBIAccesskeysMyNCBISignintoNCBISignOutTryoutPMCLabsandtelluswhatyouthink.LearnMore.JournalListUltrasoundv.26(4);2018NovPMC6243450Ultrasound.2018Nov;26(4):193–205.Publishedonline2018Aug22.doi: 10.1177/1742271X18794013PMCID:PMC6243450PMID:30479634Ultrasoundsurveillanceintwinpregnancy:AnupdateforpractitionersRTownsendandAKhalilAuthorinformationArticlenotesCopyrightandLicenseinformationDisclaimerFetalMedicineUnit,St.George'sUniversityofLondon,London,UKAKhalil,FetalMedicineUnit,St.George'sUniversityofLondon,BlackshawRoad,Tooting,London,SW170RE,UK.Emails:ku.ca.lugs@lilahka;moc.liamelgoog@97lilahkamsaReceived2018Mar3;Accepted2018Jun28.Copyright©TheBritishMedicalUltrasoundSociety2018ThisarticlehasbeencitedbyotherarticlesinPMC.Ultrasoundhasrevolutionisedthemanagementofmultiplepregnanciesandtheircomplications.Increasingfrequencyoftwinpregnanciesmandatesfamiliarityofallclinicianswiththerelevantpathologiesandevidence-basedsurveillanceandmanagementprotocolsfortheircare.Inthisreview,wesummarisethelatestevidencerelatingtoultrasoundsurveillanceoftwinpregnanciesincludingfirsttrimesterassessmentandscreening,growthsurveillanceandthedetectionandmanagementofthecomplicationsofmonochorionicpregnanciesincludingtwin-to-twin-transfusionsyndrome,selectivefetalgrowthrestriction,twinreversedarterialperfusionsequenceandconjoinedtwinning.Keywords:Twins,monochorionic,dichorionic,screening,ultrasoundSincetheintroductionofultrasoundintoroutineobstetricpractice,theadvantagesforthemotherscarryingtwinshavemovedbeyondthesimpleabilitytoidentifymultiplepregnanciesantenatallytothepossibilityofscreeningthesepregnanciesbothforthesamepathologiesasthosescreenedforinsingletonpregnancies,aswellastheidentificationandmanagementofthosecomplicationsspecifictotwinpregnancies.1–3Astwinscontinuetoincreaseinfrequency,4rou