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时间:2020-03-29
《脑淀粉样血管病.docx》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、脑淀粉样血管病(Cerebralamyloidangiopathy,CAA>CT-MRI病例图片影像诊断分析临床病史】:患者,女性,76岁,既往有进行性的痴呆病史,出现了意识丧失、括约肌张力丧失以及右侧面部下垂。76-year-oldfemalepatientwithahistoryofprogressivedementia,whopresentedwithlossofconsciousness,lossofsphinctertone,andrightsidedfacialdroop.5JS影像园XCTMR.com【影像图片】CT-MRI图像5JS影像
2、园XCTMR.com5JS影像园XCTMR.com5JS影像园XCTMR.com7/75JS影像园XCTMR.com5JS影像园XCTMR.com7/7【影像表现】:MRIofthebrainwithoutcontrastshowsdiffusecorticalatrophyaswellasmultiplesmall(<5mm>cortical-subcorticalfociofdecreasedsignalintensity,bestseeninGREsequences(greenarrowsFigure1andFigure2>.Someofthes
3、efocalareasoflowsignalintensityarenotseenorarebarelydiscernibleonT2-weightedsequences(yellowarrowsFigure3andFigure4>,andnotseenatallonT1-weighted(Figure5andFigure6>orFLAIRsequences(Figure7Figure8>.Noareasofabnormalsignalintensityareseeninthebasalganglia.Inaddition,areasofincreas
4、edwhitemattersignalintensity,compatiblewithleukoencephalopathy,arebestseenonFLAIRsequences(bluearrowsinFigure7andFigure8>.颅脑MR平扫显示弥漫性的皮质萎缩和多发性小点状<<5mm)皮质-皮质下的局灶性低信号影,在GRE序列上显示的最清楚<图1,2)。这些局灶性的低信号影在T2序列上很难显示清楚<图3、4),在所有的T1序列和Flair序列上基本上不能显示出来<图5、6、7、8)。基底节区未见异常信号,另外白质信号强度的增高,符合脑白
5、质病,在Flair序列上显示的更清楚<图7、8)5JS影像园XCTMR.comb5E2RGbCAP7/75JS影像园XCTMR.com5JS影像园XCTMR.com7/75JS影像园XCTMR.com5JS影像园XCTMR.com【影像诊断】:Cerebralamyloidangiopathy(CAA>脑淀粉样血管病5JS影像园XCTMR.comp1EanqFDPw【诊断要点】:Cerebralamyloidangiopathyisanimportantcauseofspontaneousintracranialhemorrhageinacortica
6、l,subcortical,andleptomeningeallocationintheelderlynormotensiveindividual.对于正常血压的老年患者,在皮层、皮层下、软脑膜出现自发性的脑出血,脑淀粉样血管病是一种重要的病因5JS影像园XCTMR.comDXDiTa9E3d T2*-weightedGREimagingiscurrentlythemodalityofchoicefordetectingmicrohemorrhagesassociatedwithCAA,whichappearasfocalareasofsignal
7、lossduetomagneticfieldinhomogeneitiescausedbyhemosiderin7/7deposits.T2*序列是检测CAA相关的微出血首选序列,由于含铁血黄素的沉积导致磁场不均匀而表现为局限性的信号丢失。RTCrpUDGiT【讨论】:Cerebralamyloidangiopathy(CAA>isasignificantcauseofcortical-subcorticalcerebralbleedsinthenormotensiveelderlyindividual.InCAA,beta-amyloidprotei
8、nisdepositedinthemediaandadventitiaofsmalltomed
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