Theimagingfeaturesofintracranialmedulloepithelioma / 实用放射学杂志

Objective Toanalyzetheimagingfeaturesofmedulloepitheliomaforfurtherunderstanding.Methods Theimaging findingsof12casesofmedulloepitheliomaprovedbypathologywereanalyzedretrospectively.Results Thelesionswerelocatedin cerebralhemisphere(6),cerebellum (3),ventricularsystem (3),andalloftheminvolvedbothgrayandwhitematter.Thefeatures includedlargegrosstumorvolume,clearboundaryandperitumoraledema(8/12).Othersincludedcystic-solidlesions(11/12),completelysolidlesion (1/12),andiso-orslightlyhyper-densitywithcalcificationonCTscan.ThetypicalfeatureofMRIwas "mid-lakeisland"sign,and solidcomponentshowediso-orhypo-intensityonT1WI,isoorhyper-intensityonT2WIwithhemorrhageandnecrosis,aswellasthe tumorshowedobviousheterogeneousenhancementaftercontrast.Cystcomponentshowedthin-wallring-enhancement.Conclusion Thetypicalfeatureofthemedulloepitheliomaisthe "mid-lakeisland"sign.Thetumorhasalargevolume,andthe majorityshow cystic-solidlesions.Aboveall,medulloepitheliomashouldbeconsideredifthereisasolid-cysticlesionwithclearboundaryatchildren andadolescents.

MRIandpathologicfindingsofintracranialsolitaryfibroustumor/hemangiopericytoma / 实用放射学杂志

Objective Toinvestigatethecharacteristicsofclinicalpathologyand MRIofintracranialsolitaryfibroustumor/hemangiopericytoma (SFT/HPC).Methods ThisstudyanalyzedtheMRIimages,pathologicalandclinicaldataof14SFT/HPCpatientsretrospectively. AllthecasesweresubjectedtoMRIplainscanandenhancementexamination.CharacteristicsofMRIofallcaseswerereviewedtogetherwith clinicopathologicchanges.Results AllSFT/HPClesionswerelocatedintheintracranialbutextra-cerebralspace.6werelocatedabovethe tentoriumofcerebellum,and2werelocatedbelowit.Lesionsof6patientswereacrossthetentoriumofcerebellumandspreadfrom supratentorialtosubtenorialspace.Amongalllesions,4wereroundinshape,10werelobulated,and3weresmallnodulesaroundthe edge.9ofthemexhibitednecrosisandcysticstructures.11lesionsshowedhypointensityand3casesshowedisointensityonT1WI.All thelesionswereheterogeneoushyperintensetyonT2WI,and5ofthemdisplayed"yin-yang"patternonT2WI.11casesexhibitededema.Signalof vascularvoidflow wasobservedin6cases.Thesolidpartsofthetumorsshowedsignificanthomogeneousenhancementon MRI. StrongpositiveSTAT6stainingwasobservedforthenuclearoftumorcells.Conclusion ItisdifficulttodifferentiateSFT/HPCfrom meningeoma.The"yin-yang"patternonT2WIisthecharacteristicofSFT/HPC.Inaddition,nuclearpositivestainingofSTAT6isalsospecific featureofSFT/HPCcell.

MRtextureanalysisinthedifferentialdiagnosisofintracranialsolitaryfibroustumor/hemangiopericytomasandvascularmeningioma / 实用放射学杂志

Objective ToinvestigatethevalueofimagetextureanalysisbasedonconventionalMRimagesinthedifferentialdiagnosisof intracranialsolitaryfibroustumor/hemangiopericytoma(SFT/HPC)andvascularmeningiomas.Methods 12casesofSFT/HPCand 16casesofvascularmeningiomaconfirmedbypathologywerecollected.Variousdiscriminantanalysismethodsandimagetextureanalysis techniqueswereappliedtopre-operativeroutineMRIimagesofthebrain,andthebesttextureparameterswereselectedtoclassify cases,includinglineardiscriminantanalysis(LDA),nonlineardiscriminantanalysis(NDA),principalcomponentanalysis(PCA)and rawdataanalysis(RDA).Finally,thebestclassificationsequencetextureparameterswerechosenforstatisticalanalysis.Results The enhancedT1WIwasthebestclassificationsequence.ThePOE+ACC methodhadthelowestmisclassificationrate.Theabsolutegradient skewness,theautocorrelationofthecooccurrencematrix,andthevarianceofthehistograminthetexturefeaturesoftheSFT/HPC andvascularmeningiomasweredifferent(P<0.05).Conclusion ThatbasedontheconventionalMRimagetextureanalysiscanprovidemore quantitativeinformation,anew methodandideafortheidentificationofintracranialSFT/HPCandvascularmeningioma.

MRIfindingsofreversiblespleniallesionsyndromeinadult / 实用放射学杂志

Objective TosummarizeMRIfeaturesofadultreversiblespleniallesionsyndrome(RESLES)andevaluateitsdiagnosticvalue. Methods ClinicalandMRIdataof15patientswithRESLESwereanalyzedretrospectively.Primarydiseasesandcausesincluded:encephalitis disease,cerebrovasculardiseases,metabolicandelectrolytedisorders.Theclinicalsymptomswereheadache,dizziness,changeofconsciousness, epilepticseizuresandothernonspecificneurologicsymptoms.Thecranialimagingexaminationwasperformedat3.0T/1.5TsuperconductingMR, includingT1WI,T2WI,T2FLAIRandDWI,inwhich7casesunderwentMRIenhancedscanand5casesunderwentMRAexamination.Results Among15patients,MRIfindingsofallpatientswerecharacterizedbythecharacteristic"boomerangsign"ortheovoidabnormalitysignalinthe corporiscallosisplenium,whichwaspresentedascytotoxicedema.Besides,4ofthem werecombinedwithposteriorreversibleencephalopathy syndrome(PRES),whichwascharacterizedbyvasogenicedemainthebilateraloccipital,temporal,parietallobeandcerebellarhemisphere.The clinicalsymptomsofallpatientsimprovedafterreasonabletreatment.Conclusion MRIcharacteristicfindingofadultreversiblesple-niallesionsyndromeisthecytotoxicedemaofthecorpuscallosum,whichcanbeshowedas"boomerangsign"orovalform.Imagingfindingsand clinicalsymptomsarereversible.Thecorrectunderstandingofthisdiseaseisofgreatsignificancetoclinicalrationaldiagnosisandtreatment.

MRIperformanceofpapillarythyroidcarcinomawithhobnailfeatures / 实用放射学杂志

Objective ToexploretheMRIperformanceofpapillarythyroidcarcinomawithhobnailfeatures(HPTC)andthedifferential diagnosisfromclassicpapillarythyroidcarcinoma(CPTC).Methods Dataof93patientswithconfirmedPTCandMRIexamination oneweekbeforesurgerywereretrospectivelycollected.Thedifferencesoftheage,sex,tumorsize,ADCvaluesand MRIfeaturesof HPTCandCPTCweredetermined.Results 10HPTCand78CPTCwereincludedinthisstudy.ThefrequencyofT2WIsignificantly highsignal,segmentationlinearlowsignal,lacesignandgyrus-likestructureofHPTCwassignificantlyhigherthanthatofCPTC (P=0.000).ComparedtoCPTC,HPTCshowedmoreirregularshape(P=0.005),largervolume(P=0.025),moremixedT2WI andDWIsignals(P=0.002,0.028,respectively),higherADCvalues(P=0.019),anddelayedmass-likeenhancement(P=0.041). Conclusion HPTClesionshavelargervolume,irregularshape,mixedT2WIsignals,mixedDWIsignalsandhigherADCvalues. Significantlyhighsignal,segmentationlinearlowsignal,lacesignandgyrus-likestructurearecommonlyobservedonT2WI.Delayed mass-likeenhancementpatternismorecommon.ThesecharacteristicscouldcontributetothediagnosisofHPTC.

Imaginganalysisandliteraturereviewofinvasiveangiomyxomainthepelvisandperineum / 实用放射学杂志

Objective Toanalyzeclinicalandimagingmanifestationsofaggressiveangiomyxoma(AAM)inthepelvisandperineuminorder tomakeafurtherunderstandingofthisdisease.Methods ThemedicalrecordsofpatientswithAAMinthepelvisandperineum were reviewedfromtheelectronicmedicalrecordsystem.PubMedandChinesebiomedicaldatabaseswerealsosearchedcarefully.Theclinicaland imagingfeaturesofcaseswereanalyzedtogether.Results Accordingtoinclusionandexclusioncriteria,23referenceswereincluded. 62cases(4malesand58females)ofAAMinthepelvisandabdomenwereincluded,with1inourhospitaland61casesintheliterature.The averageagewas39.0±1.2 (range:20-75years).Thetumorslocatedinthepelviccavityfor25cases,intheperineumfor11cases, inthescrotumfor1case,inthepelviccavityandperineumfor25cases.CTimagesshowedtumorswithcysticandsolidcomponents in9cases,nodularenhancementin6cases,andswirlingstrandsorlayeringinternalpatternin21cases;whileMRIimagesshoweda slightlyhyper-intensitylesiononT1andaslightlyhyper-intensitylesiononT2.Lesionsshowedswirlingstrandsorlayeringinternalpatternon MRIenhancementin41cases.Conclusion Theswirlingstrandsorlayeringinternalpatternhaveveryimportantimagingvalueinthediagnosisandthe detectionofrecurrentlesions.

CTand MRimagingforthecomprehensivediagnosisofsclerosingstromaltumorofovary / 实用放射学杂志

Objective ToexplorethecomprehensivediagnosticvalueofMSCTand MRImultiphaseenhancedscaninsclerosing stromaltumorofovary(OSST),forimprovingtheaccuracyofpreoperativediagnosis.Methods CTand MRimagesof32patients withOSSTconfirmedbysurgicalandpathologicalfindingswereretrospectivelystudied.Theclinicalmanifestations,CTand MRI findingsofthetumorswereevaluated,andthecorrelationbetweentheimaging manifestationsandthepathologicalresultswasalso analyzed.Theclinicalandimagingmanifestationsofthetumorswereanalyzedandsummarized.Results Theageof32patientsranged from21to43yearsold.Allthemasseswereunilateral,15ontheleftand17ontheright.Themaximumdiameterofthelesionwas1.8cmto 19.5cm.AlllesionswereexaminedbyCTand MRI.MRIcouldbetterdisplaythecapsuleandstructureofthetumors.25caseswere solidandcysticmassesand7casesweresolid masses.Themarginofthetumorwasobviouslyenhancedinarterialphaseofmulti-phaseenhancedscanin28cases,andinthevenousanddelayedphases,theenhancementfeaturesweresimilartothoseof"hepaticcavernous hemangioma".Scatteredenhancednoduleswerefoundinthenon-enhancedcysticzone,showing"lakeislandsign".Inarterialphase,4 casesshowedearlymildandmoderateenhancementinthemarginofthelesion,andtheenhancementdegreeinvenousphaseanddelayedphase weresimilar,withoutobviouswithdrawalmediumofcontrast.TheCTnetvalueinthemassinarterialandvenousphaseweremoreobviousthan thatinthemyometriumandthedifferenceswerestatisticallysignificant,howevertherewasnosignificantdifferenceindelayedphase. Histopathologicalexaminationshowedthatthehighandlowcelldensityareaswereinterlacedwithpseudolobularstructure.Thereweredifferent amountofthecollagenfibers,fibrocyteandlooseedemaconnective tissue,aswellasabundantparenchymavesselsintheinterstitial tissue.ImmunohistochemicalstainingofVimentin,SMAandα-inhibinin32caseswereshowed,andPRexpressionswerefound in28cases.Conclusion OSSTischaracterizedby"lakeislandsign"onCTandMRI."Cavernoushemangioma"-likeenhancedfeaturecanbemore clearlydemonstratedbymulti-phasecontrast-enhancedscanning.Theseimagingfindingsarecloselyrelatedtothepathologicalfindings.The combineddiagnosisofCTand MRIimaginghasanimportantvalueforpreoperativediagnosis.

AccurateandquantitativeevaluationoffatfractionoflumbarvertebraebodybyIDEAL-IQ / 实用放射学杂志

Objective Toexploretheclinicalvalueofiterativedecompositionofwaterandfatwithechoasymmetryandleast-squaresestimationquantitationsequence(IDEAL-IQ)foraccurateandquantitativeevaluationofvertebraebodyfatfraction(FF)of lumbar.Methods Accordingtotheresultsofbonemineraldensity(BMD),60healthycheckers/patientsmatchingthestudycriteria weredividedintothenormalBMDgroup(groupA,n=17),thelowBMDgroup(groupB,n=18)andtheosteoporosis(OP)group (OP,groupC,n=25).Theageofthreegroupswasanalyzed.T1WI,T2WI,andIDEAL-IQsequenceswerescannedwithsagittallumbar.Rectangular ROIwereoutlinedonFatFracmaps,FFsweremeasuredthreetimesonvertebraebodyoflumbar1(L1),L2,L3,L4,L5,andtheFF ofeachlumbarwasrespectivelyaveragedtoanalyzethedifferencewithinandbetweengroups.Results Theageamongthethree groups(F=13.414,P=0.000)werestatisticallysignificantdifference.Inbothcomparisons,theagewassignificantdifferencebetweengroupA andB,aswellasbetweengroupAandC,butnotbetweengroupBandC.TheFFofL1-L5withineachgroupwerenotstatistically significantdifference(F=0.680,0.863,0.539,P=0.608,0.490,0.707),whilealldifferencesbetweeneachgroupwithFFofL1-L5 werestatisticalsignificance(F=12.758,9.646,5.195,8.048,8.849,P=0.000,0.000,0.008,0.001,0.000).Comparisonbetweenthe groups,theFFofL3andL5inthegroupAandBwerenotstatisticallydifferent,aswellastheL2,L3,L4inthegroupBandC, whiletheothersbetweentwogroupswerestatisticallysignificantdifference.Conclusion Astheageincreases,BMDgraduallydecreases,whilethe FFofL1-L5graduallyincreases.ItisofaccuratelyevaluatelumbarvertebraeFFbyIDEAL-IQ,whichmayhelppredictOP.

TheapplicationofdexmedetomidinecombinedwithketamineandchloralhydrateinpediatricMRIscansedation / 实用放射学杂志

Objective Toexplorethesedativeeffectsandsafetyofdexmedetomidinewithketaminemixturenasaldropsbesideschloralhydrateoral andenemainchildren MRIexamination.Methods 619children (Group A)weresedatedbydexmedetomidinewithketamine,289 children(GroupB)weresedatedbychloralhydrateenemaand417childrenweresedatedbyoralchloralhydrate(GroupC)respectivelyinour hospital.ThelatestRamsaysedationscorewasadoptedtodeterminethesedationdepth.Thesedationscores,inductiontime,examinationtimeand recoverytimewererecordedrespectivelybeforeinduction,afterinductionandafterawakening.Results (1)Theinductiontimeof dexmedetomidinewithketaminewassignificantlyshorterthanchloralhydrate,anditsdifferencewasofstatisticmeaning(P<0.05). (2)ThesuccessrateofexaminationinGroupAwas100%;groupB61.6%;GroupC65.2%.ThesuccessrateofgroupAwassignificantlyhigher thanthatinbothgroupBandgroupC,thusthedifferencewasalsostatisticallysignificant.Conclusion AllmethodsaresafeforpediatricMRIat appropriatesedationdepth.Thesedativefailurerateofchloralhydrateishigher.Theinductionandawakeningtimeofdexmedetomidinewith ketaminemixturedropsisrelativelyshorter,thereforeithasgoodsedativeeffectintheMRIexamination.

MRIfeaturesandcommoncausesofgrowthhormonedeficiencyin childrenwithshortstaturecausedbypituitarylesions / 实用放射学杂志

Objective ToexploretheMRIfeaturesofgrowthhormonedeficiency(GHD)inchildrenwithshortstaturecausedby pituitarylesions,inordertoimprovethediagnosticlevelofthesediseases.Methods MRIandclinicaldataof624patientsofGHD withshortstaturecausedbypituitarylesionswereretrospectivelyanalyzed.Results Inshortstaturecausedbypituitarylesions,there were383caseswithanteriorpituitarydysplasia(61.4%);49casesofpituitarystalkinterruptionsyndrome(PSIS)(7.9%);16cases ofpituitaryhyperplasiaduetoprimaryhypothyroidism (2.6%);41casesofRathkecleftcyst(6.6%);74casesofemptysellasyndrome(11.9%);17 casesofpituitaryinvasionbyLangerhanscellhistiocytosis(2.7%);2casesofsellarregionalarachnoidcyst(0.3%);and42casesof craniopharyngioma(6.7%).MRIshowedtheheightofanteriorpituitarywaslessthannormal,andthelocation,sizeandsignalsof posteriorpituitaryandpituitarystalkwerenormalinanteriorpituitarydysplasia.Noorthinpituitarystalk,anteriorpituitaryhypoplasiawith ectopicposteriorpituitarywereseeninPSIS.Allofthepituitaryhyperplasiawerecausedbyhypothyroidism,inwhich MRIshowed anteriorpituitaryenlargement,upwardapophysis,obvioushomogeneousenhancement,nopituitarystalkinterruptionandabnormal signal,andthepituitaryglandreducinginsizeafterreplacementtherapy.Stalkhypophysialwasthickeningtogetherwithadisappearanceof hyperintenseoftheposteriorlobeofpituitaryglandonT1,andthesizeandsignalsofanteriorpituitarywerenormalinpituitarybeing invadedbyLangerhanscellhistiocytosis.AtrophyofanteriorpituitarywasseeninRathkecleftcyst,emptysellasyndrome,sellarregionalarachnoid cystandcraniopharyngioma.Conclusion MRIcanclearlyshowtheanatomyofpituitaryandsellarregion,whichcanprovideamorphological referencefortheearlydiagnosisanddifferentialdiagnosisofGHDinchildrenwithshortstaturecausedbypituitarylesions,andisof clinicallyimportantfortreatmentandprognosis.

ThevalueofMRIIDEALIQtechniquetoevaluate myelosuppressionduringradiotherapyandchemotherapyincervicalcancer / 实用放射学杂志

Objective ToexplorethevalueofMRIiterativedecompositionofwaterandfatwithechoasymmetryandleastsquares estimationquantificationsequence(IDEALIQ)techniquetoevaluatemyelosuppressionduringradiotherapyandchemotherapyincervicalcancer. Methods 25femalesubjectswereenrolledinthisstudy,whowereclinicallydiagnosedascervicalcancerandacceptedtheradiotherapyand chemotherapy.AllthesubjectswereperformedwithsagittalMRIIDEALIQscansineachweek’streatmentandattheendofwhole fiveweeks’therapy,soeachpatienthad6timesMRIscans.ROIweremanuallyplacedonL4,L5andS1vertebralbodyandsubcutaneousfatto measurethefatfraction.ThefatfractioncolorimageswerereconstructedonaAW (AdvantageWorkstation)4.6workstation.Results Asthe radiationandchemotherapyprocess,thevaluesoffatfractionincreasedprogressivelyonL4,L5andS1vertebralbody(P<0.001), whilethefatfractionvaluesinsubcutaneousfatappearedstableallthetime(P=0.987).Conclusion MRIIDEALIQtechniquecan evaluatethereal-timefatfraction,andradiotherapyandchemotherapyplansmaybeoptimizedaccordingtothefatfractionresult.

CTand MRImanifestationsofcerebralpleomorphicxanthoastrocytoma / 实用放射学杂志

Objective ToinvestigatetheMRIandCTimagingcharacteristicsofcerebralpleomorphicxanthoastrocytoma(PXA). Methods CTandMRImanifestationsof5cerebralPXAcasesconfirmedbypathologywereanalyzedandcomparedwiththosecases reportedindocumentation.Results The meanageof5caseswas (27±18)years,andallthecasesrespectivelyhadsinglelesion whichwaslocatedinthecortexorsubcortex.In5cases,3leionsoccurredinthetemporallobe,while1lesioninthefrontallobeand1 lesioninthecerebellarvermis.Solid-cystictumorsin3casesandsolidtumorsin2cases(including1casewithpartialpiamaterinfiltrated) wereidentifiedbyCTandMRI.ThecysticpartoflesionwasshownaslowdensitywhilethesolidpartasmixeddensityonplainCT scan,including1casewithscatteredpoint-stripecalcification.Thesolid-cysticcapsuleandthesolidpartoflesionweredemonstrated asuniform markedenhancementonenhancedCTscan.ThesolidareaoftumorwasshownasslightlyhypointenseonT1WI,slightly hyperintenseonT2WI,markedenhancement,andequisignalorhyperintenseonDWIimage.Thesolid-cysticcapsulewallwasenhanced in3cases,whilethecysticpartwasnotenhanced.ThemildtomoderateedemaaroundthetumorwasdetectedinalltumorsbyCT and MRI.Conclusion PXAoccursmostfrequentlyinthetemporallobeofadolescents.TypicalcharacteristicsofCTandMRIaresolid-cystic massandmarked-enhancementofwallnodule,withdifferentdegreeofedemaaroundthetumor.

ApplicativestudyofquantitativeparametersofDCEGMRIand3DGASLinpreoperativegliomagrading / 实用放射学杂志

Objective TostudythevalueofquantitativeparametersofDCE-MRIandthreedimensionalarterialspinlabeling(3D-ASL) inpreoperativegliomagrading.Methods 70patientsdiagnosedpathologicallywithinitialgliomawereassessedretrospectively,including 32caseswithlow-gradeglioma(LGG)and38caseswithhigh-gradeglioma(HGG).Allpatientsunderwentconventional,enhanced, DCEand3D-ASL MRIat3.0Tbeforesurgery.TheparametricvaluesofDCEsuchasvolumetransferconstant(Ktrans),extravascular extracellularspacevolumefraction(Ve),therateconstant(Kep),fractionalplasmavolume(Vp),cerebralbloodflow (CBF)andcerebral bloodvolume(CBV)wereobtainedbycorrespondingpost-processingsoftware.ThecerebralbloodflowofASL (ASL-CBF)wasalso obtained.Ttestoftwoindependentsampleswasusedtoanalyzewhetherthemaximumandaveragevaluesofeachparameterwere statisticallydifferentbetweenLGGand HGG.Thediagnosticaccuracyofdifferenttechniqueforgliomagradingwasdeterminedby ROCcurveanalysis.Results ThemaximumvaluesofDCE-Ktrans,Ve,rCBVandmaximumvalueofASL-rCBFwerestatisticallydifferent betweentheHGGandLGG (P＜0.05).AlltheparametricaveragevalueswerestatisticallydifferentbetweentheHGGandLGG (P＜0.05).ThemaximumandaveragevaluesofKtranshadarelativelyhighestdiagnosticefficiencyinallparameters,withtheAUCwere0.986 and0.971,theoptimumthresholdwere0.264and0.068,thesensitivitywere93.3%and94.1%,andthespecificitywere100%and 100%,respectively.ThemaximumvaluesofVe,rCBV,ASL-rCBFandtheaveragevaluesofallparametershadarelativelyhigher diagnosticefficiency.Conclusion ThemaximumvaluesofKtrans,VeandrCBFofDCE,themaximumvalueofASL-rCBFandtheaverage valueofeachparameterwereusefultodistinguishbetweenLGGand HGG.ThemaximumandaveragevaluesofKtransarethebest parametersforidentifyingHGGandLGG.

HistogramanalysisofenhancedT1WIintheidentificationofprimarycentral nervoussystemlymphomaandglioblastoma / 实用放射学杂志

Objective ToinvestigatethevalueofenhancedT1WIhistogramanalysisintheidentificationofprimarycentralnervous systemlymphomas(PCNSL)andglioblastomas(GBM).Methods 41casesPCNSLand30casesofGBM confirmedbypathology wereanalyzedretrospectivelyinourhospital.TheT1WI,T2WI,andenhancedT1 MRimagesofthetwogroupswerecollected,andthe MaZdawasusedtoextracttheregionofinterestROIofthetumor.Thehistogramanalysiswasperformedonthemaximalregionof interestofthetumor.Thehistogramfeaturesofthetumors,includingthemean,variance,skewness,kurtosis,andthe1,10,50,90,and 99percentiles,wereusedtofindsignificantdifferencesbetweenthetwogroups.Results Amongthe9parametersextractedfromhistogram analysis,themean,variance,skewness,1st,10th,and50thpercentileswerestatisticallysignificant (P＜0.05).Therewasnosignificant differenceinkurtosis,90thpercentile,and99thpercentile(P＞0.05).Amongtheseparameters,skewnesswasthemosteffectivein identifyingPCNSLandGBM.TheareaundertheROCcurvewas0.960,whilethesensitivityandspecificitywere80%and100%, respectively.Conclusion Thehistogramanalysiscanprovidemoreinformationaboutquantitativeparameters.Amongthem,theskewness hashighdiagnosticefficiency,andprovidesnewideasandmethodsfordifferentialdiagnosisofPCNSLandGBMinthecentralnervous system.

Applicationvalueof3DLAVAdynamiccontrastMRinBuddGChiarisyndrome / 实用放射学杂志

Objective Toinvestigatetheapplicationvalueofthreedimensionalliveraccelerationvolumeacquisition(3D LAVA) multiphasedynamiccontrastenhancedMRIinBudd-Chiarisyndrome(BCS).Methods Aretrospectiveanalysiswasperformedforthe clinicaldataof49patientswithBCSwhounderwent3DLAVA multiphasedynamiccontrastenhanced MRIandwereconfirmedby DSA.Theappearanceofinferiorvenacava,hepaticvein,accessoryhepaticvein(AHV)andcollateralcirculationonbothDSAand3D LAVA wereobserved.BCStypeandAHVnumberswereanalyzedusingtheχ2test.3DLAVAandDSAinthemeasurementofthe mean diameter of A H V were compared by Student’s t test.The Kappa statistics was calculated to quantify the consistency between thetwomethodsinthedetectionofAHV.Results Amongthe49patients,therewasnosignificantdifferencebetweenMRIandDSA inBCSclassification (P＝0.694).MRIandDSAshowedstatisticalsignificances(P＜0.01)inthenumberofAHVandthemeancaliber of the A H V respectively.T he Kappa coefficient (K＝0.621 ) de m onstrated good consistency for the tw o m ethods in detecting the numberofAHV.3DLAVAshowedmoreadvantagesincollateralcirculationthanDSA.Conclusion 3DLAVA mayaccuratelydetect hepaticvein,inferiorvenacava,AHV,andextrahepaticcollateralcirculationinBCSandcanhelptoevaluatethepatient’sconditionas wellastoselectthealternativemodalityininterventionaltherapy.

PreoperativepredictionofmassivepostpartumhemorrhageinplacentapreviabyMRI / 实用放射学杂志

Objective ToinvestigatethevalueofpreoperativeMRIforplacentapreviainpredictionofmassivepostpartumhemorrhage. Methods AretrospectiveanalysisoftheclinicalhistoryandprenatalMRIfeaturesof362patientswithplacentapreviawereperformed. Ofthese,54casesexperiencedseverepostpartum hemorrhage.Results Univariateanalysisshowedthattheageofpregnantwomen (χ2＝3.951,P＝0.047),gestationalage(χ2＝6.257,P＝0.012),numberofcesareansections(χ2＝36.372,P＝0.001)andgemellary pregnancy(χ2＝7.933,P＝0.005)wereassociated with massivepostpartum hemorrhage.Amongthe MRIsigns,Uterinebulging (OR,46.712;95%CI,13.067－166.987),placentalprotrusionsign (OR,22.787;95% CI,4.595－113),andintroplacentalT2dark band(OR,14.757;95%CI,7.149－30.461)indicatedhighriskwithmassivepostpartumhemorrhage.Myometrialthinningorlocalized interruption,unevenplacentalsignal,abnormalbloodvesselsbelowtheplacenta,abundantbloodvesselsinloweruterusandcervix, cervicalshorteningandothersignsfortheevaluationofseverepostpartumhemorrhagewerealsostatisticallysignificant.Conclusion MRIcanpredictmostoftheseverepostpartumhemorrhagebeforesurgeryandisveryhelpfultoimprovethepatientprognosis.

CTand MRIfindingsofovariancysticlesions / 实用放射学杂志

Objective ToimprovetherecognitionofovariancysticlesionsbyanalyzingCTand MRIappearances.Methods A retrospectivereviewofCTand MRIimagesof67caseswithpathologicallyprovenofovariancysticlesionswasperformed.Among which,58casescarriedoutplainCTscan,52casesunderwentenhancedCTscan,12casesunderwentplainMRIscan,and7casesunderwent enhancedMRIscan.Results 20caseswereovariancystadenomas,14caseswerecystadenocarcinomas,8caseswereteratomas(1case wasmalignant),5caseswerestrumaovarii,15caseswerecysts,3casesweremetastases,and2caseswereovariantuberculosis.The CTand MRIcharacteristicsofthecysticlesions,inculdingsize,shape,thicknessofcystwall,wallnodule,densityorsignalintensity andenhancementfeatureswerevaluableindifferentialdiagnosisofovariancysticlesions.Conclusion CTand MRIappearancesofovarian cysticlesionshavesomecharacteristics,includingcysticwallandseptaofcystadenocarcinomasirregularthickened,papillaryprotuberance andascites.Teratomasoftencontainfatandcalcification.Strumaovariipresentsmultilocularcystic-solidmass,withthesolidportions markedenhancement.Metastatictumorshaveahistoryofprimarygastrointestinalneoplasmsandperitonealeffusion.

ThevalueofDCEGMRIparametersofReferenceRegionandExtendedToftsmodel indifferentiatehyperGcellularuterineleiomyoma / 实用放射学杂志

Objective ToanalyzethevalueoftheDCE-MRIparametersofReferenceRegionandExtendedToftsmodleinthedifferential diagnosisofhyper-cellularuterineleiomyoma.Methods 59patientswithuterineleiomyomaconfirmedbysurgeryandpathologywere enrolledinthestudyfromSeptember2015toSeptember2016,including28casesofclassicalleiomyoma,12casesofcellularleiomyoma and19casesofdegenerativeleiomyoma.AllpatientsunderwentDCE-MRIbeforesurgery.Thequantitativeperfusionparameters (transferconstant(Ktrans),extravascularextracellularspacevolumeratio(Ve),effluxrateconstant(Kep),andbloodplasmavolume ratio(Vp)weremeasuredviaReferenceRegionmodel(RR model)andExtendedToftsmodel(ET model)respectively.ROCcurve wasusedtoevaluatetheefficiencyofthequantitativeperfusionparametersindifferentialdiagnosisofhyper-cellularuterineleiomyoma. Pearsoncorrelationanalysiswasalsoappliedtoobservethecorrelationsamongallequivalentparameters.Results KtransandKepinRR modelandKtrans,Kep,VeandVpinET modelshowedstatisticalsignificancesamongthreetypesofuterineleiomyoma (P＜0.05), meanwhile,theAUCsofKtrans,KepandVpderivedfrom RR modelandKtrans,Kep,VeandVpcalculatedbyET modelindiagnosisof cellularuterineleiomyomawere0.835,0.752,0.706,0.956,0.871,0.656and0.754.TheKtransintheRR modelwascorrelatedwith KtransintheET model(r＝0.600,P＜0.001),KepintheET modelwaspositivecorrelatedwithKepandVpinRR model(r＝0.275, P＝0.035;r＝0.376,P＝0.003).Conclusion Thevalueof Ktrans ,Kep and Vp in RR and Ktrans ,Kep ,Ve and Vp in ET modelcan be useful inthedifferentiationofhyper-cellularleiomyoma,especiallythevaluesofKtransandKepinET modelhavehigherdiagnosticefficacy thanthoseinRR model.

ApplicationofmultiGparameterMRIinthediagnosisofprostatecancer / 实用放射学杂志

Objective Toexploretheapplicationvalueofmulti-parametermagneticresonanceimaging(MP-MRI)inthediagnosis ofprostatecancer(PCa).Methods Theclinicaldataof50patientssuspectedasPCaandadmittedbetweenJanuary2017andJanuary 2018wereretrospectivelyanalyzed.Thepathologicalexaminationwasusedasthegoldstandard,andallpatientsunderwentMP-MRI. Theapplicationvalues(sensitivity,specificity,accuracy,positivepredictivevalue,andnegativepredictivevalue)ofMP-MRIwereevaluatedin thediagnosisofPCa.Results Amongsingleexaminationofeachsequence,thesensitivity,accuracyandnegativepredictivevalueof DWIwerehigher,whilethespecificityandpositivepredictivevalueofT2WIwerehigher.ThesensitivityofMP-MRIcombinationwas assameasthatofDWI,butthespecificity,accuracy,positivepredictivevalueandnegativepredictivevaluewerehigherthanthoseof anysingleexamination.PI-RADSscoresofthePCawerehigherthanthoseofthebenignprostatichyperplasiainT2WI,DWI,DCE-MRI and MP-MRIcombination(P＜0.05).TheADCvalueofthePCawaslowerthanthatofthebenignprostatichyperplasia(P＜0.05). Conclusion MP-MRIcombinationcanobtain moreeffectiveinformationforprostatediseases,andhashigherspecificity,accuracy, positivepredictivevalueandnegativepredictivevalueindiagnosingPCa.

StudyonthedistributionoflumbarModicchangesinpatientswithlowbackpain / 实用放射学杂志

Objective TostudythedistributioncharacteristicsofModicchanges(MCs)onlumbarvertebraeinthepatientswith lowbackpain.Methods LumbarvertebraeMRIresultsfrom276patients(male:104,female:172)wereanalyzedretrospetively.The MConlumbarvertebraewereclassifiedwithT1WI,T2WIandT2WI-FS,meanwhiletheincidence,predilectionsitesanddistribution characteristicsbyageandsexwerestatisticallyanalyzed.Results 139cases(50.4%)couldbeseenwith MC,including42malesand 97females;while137caseswerenormal(49.6%).Classifiedbygender,numbersofpatientswith MCinagegroup20－39 were7 (male)and11(female);inagegroup40－59,were15(male)and44(female);andinagegroup60－78,were20(male)and42(female). Amongatotalof2760vertebralendplates,2450 (88.8%)wereclassifiedasModicType0,65 (2.4%)asTypeⅠ,153 (5.5%)as TypeⅡ,3 (0.1%)asTypeⅢ,and89 (3.2%)as MixedType.ThenumbersofMCoccurringonendplatesofL5/S1,L4/5,L1/2 were108,103and15respectively.Conclusion MCTypeⅡoflumbarvertebraeisthemostprevalent,followedbythe MixedType and MCTypeⅠ.MCTypeⅢistheleast.Inallthreeagegroups,theincidencerateishigherinfemalepatientsthanthatinmales. Regardlessofthegender,theincidenceofMCislinearlypositivecorrelatedwithage.MCoccursmostlyonendplatesofL5/S1and L4/5,andrarelyonendplateofL1/2.