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CentralNervousSystem南京醫(yī)科大學(xué)一附院放射科洪汛寧hongxunning@2/3/20231TheFiveMostCommonStrokeSymptomsSuddennumbnessorweaknessofface,armorleg,especiallyononesideofthebody.Suddenconfusion,troublespeakingorunderstanding.Suddentroubleseeinginoneorbotheyes.Suddentroublewalking,dizziness,lossofbalanceorcoordination.Suddensevereheadachewithnoknowncause.(Source:NationalStrokeAssociation)2/3/20232OtherImportantbutLessCommonStrokeSymptomsSuddennausea,feverandvomitingdistinguishedfromaviralillnessbythespeedofonset(minutesorhoursvs.severaldays).Brieflossofconsciousnessorperiodofdecreasedconsciousness(fainting,confusion,convulsionsorcoma).Source:NationalStrokeAssociation2/3/20233ClinicalFeaturesDependsonvascularterritoryinvolvedUsuallyabruptonsetMostprecise:levelsofconsciousness(LOC),grossmotorlevelLeastprecise:sensoryexam,history(includingTIA)Clinicalexamperformanceimproveswithtraining2/3/20234腦血管疾病
(cerebrovasculardisease)腦梗死(cerebralinfarction)腦出血(intracranialhemorrhage)動(dòng)靜脈畸形(aterio-venousmalformation)蛛網(wǎng)膜下腔出血(subarachnoidhemorrhage)和顱內(nèi)動(dòng)脈瘤(intracranialaneurysm)2/3/20235
TheconsequencesofcerebralischemiadependonthedegreeanddurationofreducedCBF.Neuronscantolerateischemiafor30-60minutes.Perfusionmustbereestablishedbefore3-6hoursofischemiahaveelapsedorbeforetheCBFdropsto10.腦梗死cerebralinfarction2/3/20236cerebralinfarctionPathologicchangeswithintheneuropilfollowthemetabolicabnormalities.OneofthefirsteffectsiscytotoxicedemathatresultsfromfailureoftheNa/Kionpump.Earlyon,thisstageisstillreversible.Prolongedischemialeadstocelldeathandcoagulationnecrosis.After3-6hoursofischemia,irreversibledamageoccurstothecapillaryendothelium.2/3/20237CTandMRscansinpatientswithasymptomaticbruitsorTIA'sareusuallynegative.Theearliestsignmaybeabnormalvasculardensity/signal.ThefirstparenchymalchangesobservedonCTandMRreflectthecytotoxicedemaaffectingprimarilythegraymatter.ischemiccerebralinfarction2/3/20238ItisimportanttorememberthattheCTscanmaybenegativeforthefirst24-48hours.Massiveinfarctionsmaybevisibleasearlyas6hours.TheMRscanisusuallypositivewithinthreetofourhoursfollowingastroke.OneoftheearliersignsonCTislossofthenormalgray-whitecontrastastheedematouscortexbecomesisodensetotheunderlyingwhitematter.After6-8hourstheaccompanyingvasogenicedemahighlightstheareasofbraininfarction.ischemiccerebralinfarction2/3/20239CTCT掃描見(jiàn)低密度灶。常呈扇形,基底貼近顱內(nèi)板,尖指向顱腦中心。早期(1~2天)邊界較模糊,中后期(2~7天)邊界較清,無(wú)占位征或略有占位征。病灶部位和范圍與閉塞血管的所屬供血區(qū)域一致1~3周時(shí)可出現(xiàn)模糊效應(yīng)(側(cè)支循環(huán)建立)增強(qiáng)掃描可呈輕度腦回狀強(qiáng)化(血腦屏破壞及側(cè)循建立)1~2月后可出現(xiàn)低密度腦軟化或伴腦萎縮。注:24小時(shí)內(nèi)檢出率低,24~48小時(shí)后檢出率高,2天~2周水腫較明顯。2/3/202310TopographicVascularSupply
(Http://www.C/nm-Mediabook/figures/brainfigs.Html)2/3/202311ACATerritoryStroke2/3/202312PCATerritoryInfarct2/3/202313RightPICAStroke
(/~c064s01/nr251.htm)2/3/202314
male56yearsold,
150minaftersymptom
常規(guī)CTTimetoPeakCBF隨訪
顱內(nèi)動(dòng)脈栓塞
隨訪CT顯示液化灶2/3/202315Cerebralinfarction2/3/2023162/3/2023172/3/2023182/3/202319HyperacuteStroke:CT
(Koeller,AFIPStrokeLecture)HyperdensearteryBasalgangliaobscuredInsularribbonlostEdema:sulcalorventriculareffacement2/3/202320HyperdenseMCASignPrognosticValueoftheHyperdenseMiddleCerebralArterySignandStrokeScaleScorebeforeUltraearlyThrombolyticTherapyAJNRAmJNeuroradiol
17:79–85,January19962/3/202321HyperdenseRightMCA2/3/202322AxialunenhancedCTimageobtainedina53-year-oldmanshowshypoattenuationandobscurationoftheleftlentiformnucleus(arrows),which,becauseofacuteischemiainthelenticulostriatedistribution,appearsabnormalincomparisonwiththerightlentiformnucleus.2/3/202323ObscurationoftheRightBasalGangliainAcuteStroke
(AJNRAmJNeuroradiol17:1743–1748)2/3/202324AxialunenhancedCTimages,obtainedina45-year-oldman2hoursaftertheonsetoflefthemiparesis,showobscurationoftherightlentiformnucleus(arrowinb).Thisfeatureislessvisiblewiththeroutinebrainimagingwindowusedfora(windowwidth,80HU;center,35HU)thanwiththenarrowerwindowusedforb(windowwidth,10HU;center,28HU).2/3/202325MRI檢出腦梗塞較CT敏感。梗塞6小時(shí)內(nèi),細(xì)胞毒性水腫,梗塞區(qū)含水量高,T1、T2時(shí)間延長(zhǎng)。6小時(shí)后漸出現(xiàn)血管源性腦水腫,血腦屏障破壞。較高檔MR應(yīng)用MRI彌散成像和灌注成像,能更早期發(fā)現(xiàn)病灶,有利于早期治療。2/3/202326DIFFUSION&PERFUSIONIMAGING
ConventionalCTandMRimagingarenotsufficientlysensitivetoevaluateacutestroke.Theultimategoalforimagingistodefinetheareaofbraininfarctionandperfusiondeficit,andtoidentifyanyischemictissuethatcanbesalvagedbymedicalorsurgicaltherapy.DWIcandetectacutebraininfarctionwithin1to2hours.Perfusionimagingispositiveimmediatelyfollowinganacutestroke.2/3/202327AcuteRightMCAStroke2/3/202328AcuteMCAStrokewithDiffusion
2/3/2023294P’sofAcuteStrokeImaging?Parenchyma–Assesearlysigns,excludehemorrhagePipes–Assessextra&intracranialcirculationPerfusion–AssessCBV,CBF,&MTT
Penumbra–Assesstissueatriskofdying2/3/202330HemorrhagicInfarct
(Koeller,AFIPStrokeLecture) 10%ofacutestroke.
HigherincidenceinAsianpopulation. <24hours. Anticoagulationcontraindicated.2/3/202331HemorrhagicCerebralInfarction2/3/202332HemorrhagicStroke
AJNRAmJNeuroradiol
18:1011–1020,June19972/3/202333HemorrhagicTransformation
(Koeller,AFIPStrokeLecture) >24hoursafterinfarctbydefinition Peak:1-2weeks
Diapedesis血細(xì)胞滲出Occursafterreperfusion:thefullpressureofarterialbloodintohypoxiccapillariesresultsinadiapedesisorredcellsmovingthroughthevesselhypoxicwalls
Occursinupto50%ofstrokes Confirms
ischemicnatureofinfarct2/3/202334HemorrhagicTransformation
/AANLIB/cases/case42/mr1/012.html2/3/202335腔隙性腦梗死lacunarinfarction丘腦基底節(jié)區(qū)或深部腦髓質(zhì)小血管(A)閉塞所致CT征象:于好發(fā)部位見(jiàn)小的低密度灶,一般為1~1.5cm大小,早期邊界較模糊,中晚期邊界較清MRI檢查腔梗灶較CT敏感高,早期更易發(fā)現(xiàn)2/3/202336lacunarinfarction2/3/202337MRIT2WI,T1WI,flairlacunarinfarction2/3/202338存在問(wèn)題致死率及致殘率2/3/202339影像學(xué)研究策略腦梗死前期腦缺血的影像學(xué)研究Hypo-PbeforeIS2/3/202340IntracranialHemorrhageVerycommonTrauma,Hypertension;Aneurysm;VascularMalformationOthers:Embolicstrokewithreperfusion;Amyloidangiopathy;Coagulopathies;Drugabuse;Tumor2/3/202341CTofIntracranialHemorrhage
Allcerebralhematomas,whateverthecause,haveasimilarresolutionpatternonCT.Therateofresolutiondependsonthesizeofthehematoma,usuallywithinonetosixweeks,andtheyresorbfromtheoutsidetowardthecenter.Perihematomalowdensityappearsin24-48hours.Rimenhancementappearsinoneweekandpersistsforsixweeks.Theendresultofahematomaisdecreasedparenchymaldensity,focalatrophyandlocalventriculardilatation.2/3/2023422/3/2023432/3/2023442/3/202345腦內(nèi)血腫(T1,T2,turbo-T2)其內(nèi)有陳舊性出血2/3/202346腦干出血2/3/202347發(fā)病當(dāng)時(shí)CT發(fā)病兩年后MRI復(fù)查2/3/202348腦血管畸形(AVM)影像可以明確診斷,還可以觀察大小及血供情況,常有腦萎縮目前主要是血管成像(DSA、CTA、MRA等)可直接顯示畸形血管2/3/202349CTCTfeaturesofanAVmalformationonplainscanincludeahigh-absorptionirregularmasswithlargefeedingarteriesanddrainingveins,focalareasofcalcificationandnosurroundingedemaormasseffect.Thecontrastscanshowsserpiginousenha
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