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BraintumorPituitaryAdenomasacountfor10%ofallprimaryintracranialtumorsmacroadenomasandmicroadenomasmicroadenomas10mmorlessindiameterplainCT

isodensewiththeadjacentnormalpituitaryglandEnhancementoccursisusuallydelayedcomparedtotheimmediate,intenseenhancementofthenormalpituitaryglandmacroadenomasarelargerthat10mmNecrosis,hemorrhage,andcystformationarecommonisodensewithcortexonplainCTscanshaveacharacteristicfigure“8”appearanceonimagingMRIplainMacroadenomascanbulgesuperiorlyextendingthroughthediaphragma

sellaeintosuprasellarcistern.OpticchiasmaiscompressedMRIcontrast

haveacharacteristicfigure“8”appearanceonimaging

ContrastMRacousticneuroma

isthemostcommoncerebellopontineangle(CPA)massaccountingfor75%to80%ofalllesionsinthislocation

Imaging

LocationCPAslightlyhypointense/isointensetobrainonT1WItheinternalacousticcanalbecomewiderCalcificationandhemorrhagearerare.IntenseenhancementMetastaticTumorsaccountfor30%ofintracerebraltumorsAtgray-whiteinterfaceMultipleEdemaisstrikingenhancestronglyMetastaticTumorsBraintrauma

HaveatraumahistorySkullfractureDiffuseCerebralEdemaEpiduralHematoma(EDH)Subdural

hematoma(SDH)BraintraumaEpiduralHematoma(EDH)Definitions•Bloodcollectionwithinpotentialspacebetweenskullinnertable&duramaterEpiduralHematoma(EDH)Featuresinimages•

HyperdensebiconvexmassonCTinacutephase•Location:Epiduralspacebetweenskull&dura,nearlyallEDHoccuratimpactsite•Doesnotcrosssutures,butcancrossfalx&tentorium

•Compresses&displacesunderlyingbrainScalpHematomas

EpiduralHematomaSubdural

hematoma(SDH)Definitions

•hemorrhagiccollectioninsubduralspaceSubdural

hematoma(SDH)

•Crescent-shaped,homogenouslyhyperdenseonCT,extra-axialcollectionthatspreadsdiffuselyoveraffectedhemisphere

•LocationoBetweenarachnoid&innerlayerofduraoMaycrosssuturesoMayextendalongfalx&tentoriumoCompresses&displacesunderlyingbrainSubdural

HematomaSubdural

HematomaNontraumaticHemorrhageEtiology:Hypertension,Aneurysm,

VascularMalformation,strokeLocation:basalgangliathalamus

ponsFeaturesonimages:Hyperdense(50-70HU)massonNECTCerebralinfarctionInfarctionreferstobraindamage,beingtheresultofischemia<6hplainCTscansnegativeMRpositiveLacunar

lnfarctsArteriovenousmalformation

(AVM)ImagingfeaturesBestdiagnosticclue:"Bagofblackworms"(flowvoidssignal)onMRwithminimal/nomasseffectCONTRASTANEURYSMImagingfeaturesRound/lobulated

outpouchingLocation:circleofWillisorMiddlecerebralartery(MCA)bifurcationTechnique:DSA,CTA,MRA3D-VR3d3D-VR动脉瘤ANEURYSMDiscussionCase1Femalpatient,25yearsoldAmenorrheaandlactation

for1yearCase2Malepatient,30yearsoldHisheadwashitatatrafficaccident4hoursago

Case3Malepatient,40yearsoldH

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