脑后部可逆性脑病综合征的mri及dwi特点

《脑后部可逆性脑病综合征的mri及dwi特点》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、万方数据828墼塾堂壅壁!!!!至!旦星丝鲞星!塑曼!!!!!旦翌生堡!垒!g!!!!!∑!!!!：型!：!●脑后部可逆性脑病综合征的MRI及DWI特点中枢神经影像学王志群，李坤成，武力勇，赵澄．【摘要】目的：49讨脑后部可逆性脑病综合征(PRES)的MRI及扩散加权成像(DWI)特点。方法：回顾性分析3例临床诊断为PRES患者的临床资料，患者均表现为头痛、视物不清，并伴有高血压。所有患者均行常规生化、脑脊液、血及尿常规检查，行常规MRI、MRA及DWI扫描。结果：3例PRES患者MRI示双侧顶枕区

2、皮质及皮层下白质多发病灶，在T．wl上病灶呈等信号或略低信号，FLAIR及T2Wl上呈高信号，DWI显示部分病灶呈等信号或低信号，表现弥散系数图(ADC)上呈高信号，部分病灶DWI上呈高信号，ADC上呈等信号。治疗后随访MRI显示所有患者病灶逐渐减小、消失。结论：PRES好发于顶枕叶皮质及皮层下白质．病变早期为血管源性水肿，晚期可表现为细胞毒性水肿，治疗及时可逆转，采用MRI及DWI成像结合其临床特征可做出较为准确的诊断。【关键词】脑后部可逆性脑病综合征·磁共振成像；扩散加权成像【中图分类号】R44

3、5．2；R742【文献标识码】A【文章编号11000—0313(2009)08—0828—04MRIandDWIManifestationsintheDiagnosisofPosteriorReversibleEncephalopathySyndromeWANGZhi—qun，LIKun-cheng，WULi-yong，eta1．DepartmentofRadiology，theCapitalUniversityofMedicalScienceXuanwuHospital，Bering100053，

4、P．R．China[Abstract]0bjective：TostudytheMRIanddiffusionweightedimaging(DWI)featuresofposteriorreversibleen—cephalopathysyndrome(PRES)．Methods：ThreecaseswithPRESwereconfirmedbyclinichistory，whichpresentedhead—ache．visualdisorderandhypertension．Theroutine

5、biochemicalexamination，cerebrospinalfluidexamination，bloodandurinroutineexaminationwereperformedforallthecases．ConventionalMRI，MRangiographyandDWlwereperformedforthethreepatients．Results：MRIrevealedmultiplelesionswhichwerelocatedinbilateralparietalando

6、ccipitallobes，involvinggreymatterandwhitematter．HyperintensityofthelesionswasrevealedonT2WIandFLAIRimages；isointensityormildhypointensityonT1WI．SomeoflesionsshowedisointensityorhypointensityonDWIandhyperintensityonapparentdiffu—sioncoefficient(ADC)maps

7、．Ontheotherhand，someOflesionsshowedhyperintensityonDWIandisointensityonADCmaps．Follow-upscansshoweddiminutionordisappearanceofthelesion．Conclusion：ThelesionsofPRESareusuallyIoca’tedinparietalandoccipitallobes，presentvasogenicedemaintheearlystageandthec

8、ytotoxicedemainthelatestage．Thelesionscanbereversiblebypropertreatment．WiththeapplicationofMRI，especiallyDWI，combinedwithclinicalmanifes—tations，thediagnosisofPREScabbemadedefinitely．[Keywords]Posteriorreversibleencephalopathysyndrome；M