CT imaging of the temporal bone an anatomical review with illustrative cases of cholesteatomas

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1、CTImagingoftheTemporalBone:ananatomicalreviewwithillustrativecasesofCholesteatomasDuniaAbdul-Aziz,HMSIIIDr.GillianLiebermanBethIsrael-DeaconessRadiologyMay19,2008OutlineReviewoftheNormalEarAnatomyTympanicMembraneMiddleEarCavityOssicularChainSpacesWallsCharacteristi

2、cCToftheNormalTemporalBoneAxialCoronalCholesteatoma:IllustrativePathologyonCTPatientpresentationOverviewofcholesteatomaDiagnosis,Pathogenesis,Differential,ManagementSelectedcasesfromcompanionpatientsHumanEarNetterFH,2003HumanEarExternalEarNetterFH,2003HumanEarMiddl

3、eEarNetterFH,2003HumanEarInnerEarNetterFH,2003MiddleEarAnatomyAir-containingspacecommunicateswiththenasopharynxviatheeustachiantube.normallysealedlaterallybyTM.Function:transmissionandamplificationofsoundfromTMtostapesfootplate.AndersonJF,1983SpacesoftheMiddleEarMidd

4、leEardividedintofivespacesbasedonrelationshiptotympanicannulus.Epitympanum(Attic)-superiortoannulusContains:bodyofincusandheadofmalleus.communicateswiththemastoidviaaditus.Mesotympanum-onlevelwiththeTMContains:ovalandroundwindowslongprocessofincus,articulationwiths

5、tapes.facialnerveinbonycanalHypotympanum–belowannulusContains:jugularbulbProtympanum-inanteriorrecessofthemiddleearContains:eustachiantubeRetrotympanum–posteriortoannulusContains:sinustympani,facialrecessAndersonJF,1983InsidetheMiddleEar:OssicularChainMalleus:long

6、process(manubrium),shortprocess,headTensortympanim.Incus:shortprocess,longprocessLenticularprocess:distalportionoflongprocessMosttentativebloodsupplysusceptibletoresorptioninotitismediaStapes:SuperstructureandfootplateStapediusm.LalwaniAK,2004WallsofMiddleEar(Tympa

7、nic)CavityAgurAM,1999WallsofTympanicCavity:RoofandFloorRoof:tegementympaniFloor:Superiorbulbofinternaljugularv.AgurAM,1999WallsofTympanicCavity:LateralRoof:tegementympaniLateral:•TM,malleushandleFloor:Superiorbulbofinternaljugularv.Grant’sAtlas,1999WallsofTympanicCavity:M

8、edialRoof:tegementympaniLateral:Medial:•TM,malleushandle•Promontory•Ovalwindow--stapes•Roundwind