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1、PRIMARYINTRACRANIALNEOPLASMSMonikaArora,MS4LyudmilaMorozova,MS4ImagingforBrainTumors1SkullX-rays:Rarelynecessary.Usefulindemonstratingcalcification,erosion,orhyperostosisCT:MostwidelyusedfordiagnosisofbraintumorsWilldetect>90%oftumors,butmightmiss:SmallTumors(<0.5cm)TumorsAdjacentto
2、bone(pituitaryadenomas,clivaltumors,andvestibularschwannomas)BrainStemTumorsLowGradeAstrocytomasMoresensitivethanMRIfordetectingacutehemorrhage,calcification,andbonyinvolvementMRI:Preferredforfollow-upofmostbraintumorsMoresensitivethanCTscansCandetectsmalltumorsProvidesmuchgreateran
3、atomicdetailEspeciallyusefulforvisualizingskullbase,brainstem,&posteriorfossatumorsInfratentorialvsSupratentorialTumorsSUPRATENTORIALTUMORS3MeningiomasGliomasAstrocytomasGlioblastomaMultiformeOligodendrogliomasGerminomasColloidCystsofThirdVentricleMENINGIOMA1,2,3Epi:2ndmostcommonpri
4、marybraintumoraftergliomas,incidenceof~6/100,000Usualage40-70F>MFacts:ArisefromarachnoidalcapcelltypefromthearachnoidmembraneUsuallynon-invasiveAssociatedwithNF-2Location:ParasagittalregionSphenoidwingParasellarregionPresentation:AsymptomaticSymptomatic:focalorgeneralizedseizureorgr
5、aduallyworseningneurologicdeficitMENINGIOMA1OnImagingCT:isodenseorhypodense,homogenousextra-axialmasswithsmoothorlobulated,clearlydemarcatedcontourswhichenhancehomogenouslyanddenselywithcontrastFrequentlyhaveareasofcalcificationandproducehyperostosisofadjacentbone.MRIIsointensewithg
6、raymatteronT1imagesEnhancewithcontrast–oftenwithenhancingduraltrailextendingfromthetumorattachmentGLIOMASArisefromGlialCellsAstrocytomasAstocytomasfallonagradientthatrangesfrombenigntomalignantOligodendrogliomasLowGradePilocyticAstocytomasGlioblastomamultiformeBenignMalignantDiffuse
7、LowGradeAstrocytomasASTROCYTOMA1,2,3:DiffuseLowGradeAstrocytomaEpi:15%ofAstrocytomasYoungAdultsFacts:WidelyInfiltratesurroundingtissueLocation:FrontalRegionSubcorticalwhitematterPresentation:SeizuresHeadacheSlowlyprogressiveneurologicdeficitsOnImaging:CT:Wellcircumscribed,nonenhanci
8、ng,hypodenseorisode
