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Purpose ToanalyzetheMRIfeaturesofplacentalpreviawithplacentalaccrete. Methods 45casesofpregnantwomenwithplacentapreviaandvaginalbleeding inourhospitalfromJanuary2013toApril2014 wereincludedinthestudyandanalyzed,retrospectively.27casesofinvasiveplacentawereprovedbysurgerypathology,which included14casesofplacentalaccrete,11casesofplacentalincretaand2casesofplacentalpercreta.Allcasesunderwent1.5T conventionalMRIsequencescan.The5mainsignsbetweentwogroupswereanalyzed,andthebiggestinnerdiameterof abnormalbloodvesselswhichlocatedonuteroplacentalinterfaceorwithintheplacentawasmeasured.Fisherexacttestand Kruskal-WallisHtestwereusedforstatisticalanalysis. Results(1)In27casesgroup,uteroplacentalinterfaceorintraplacentademonstratedtwistedandincreasedbloodvessels,and thedifferenceofthebiggestvascularinnerdiameterinthreegroups(placentalaccrete,incretaandpercreta)hadstatistical significance(P=0.000).(2)ThelossofT2darkzoneunderplacentainthreegroups(no-invasiveplacenta,adhensiveandinvasive placenta)hadstatisticaldifference(P=0.017).Thedifferenceinabnormalvascularityonuteroplacentalinterfaceorintraplacental, bulgingoftheloweruterinesegment,markedplacentalheterogeneityandirregularthickintraplacentalT2darkbandsbetween thetwogroups(no-invasiveandinvasiveplacenta)hadstatisticalsignificance(P=0.000,0.014,0.005,0.036).Irregularthick intraplacentalT2darkbandsandabnormaluteroplacentalinterfaceorintraplacentalvascularityhadnostatisticaldifference betweenplacentalaccretaandplacentalincreta(P=0.389,1.000). Conclusions AbnormaluteroplacentalinterfaceorintraplacentalvascularityisanimportantspecificMRIfeatureofplacenta accreta,andthesizeandrangehascorrelationwiththedegreeofplacentaimplantation.Themaincommonsignsforplacental accreteincludedbulgingoftheloweruterinesegment,markedplacentalheterogeneity,irregularthickintraplacentalT2dark bandsandlossofT2darkzoneunderplacenta.ThelossofT2darkzoneunderplacentawithabnormaluteroplacentalinterface orintraplacentalvascularityishelpfultodistinguishplacentalinvasionandadhesion.