Introduction:Superiorsemicircularcanaldehiscence(SCD)remainsdifficulttodiagnosedespiteadvancesinhigh-resolutioncomputedtomography(HRCT)imaging.Wehypothesizepossibleassociationsbetweengrosstemporalboneanatomyandsub-millimeterpathologyofthesemicircularcanals,whichmaysupplementimagingandclinicalsuspicion.ThispilotstudyinvestigatesdifferencesingrosstemporalboneanatomicparametersbetweentemporalboneswithandwithoutSCD.Methods:Recordswerereviewedfor18patientsreferredtoanotologycliniccomplainingofdizzinesswithnormalcaloricstimulationresultsindicativeofnon-vestibularfindings.ElevenpatientshadnormaltemporalboneanatomywhilesevenhadSCD.Three-dimensionalreconstructionofeverypatient'stemporalboneanatomywascreatedfrompatient-specificcomputationaltomographyimages.Surfacearea(SA),volume(V),andSAtoVratios(SA:V)werecomputedacrosstemporalboneanatomicalparameters.Results:SCDtemporalboneshavesignificantlysmallerV,andlargertemporalboneSA.Mean(士SD)Vwas21,484±3,921mm3intemporalboneswithoutSCDand16,343±34,471mm3forthosewithSCD.TheirrespectiveSAwere13,733±1,603mm2and18,073±3,002mm2.TemporalboneairspacesandlateralsemicircularcanalsdidnotdemonstratesignificantdifferenceswhereSCDwasandwasnotpresent.PlotsofMVwarmresponseagainstcomputedSCDtemporalboneanatomicparameters(SA,VandSA:V)showedmoderatetostrongcorrelations:temporalboneSA:V(r=0.64),temporalboneairspaceV(r=0.60),temporalboneairspaceSA(r=0.55),LSCCSA(r=0.51),andLSCC-to-TMDistance(r=0.65).Conclusions:ThisanalysisdemonstratedthatSCDisassociatedwithdecreasedtemporalbonevolumeanddensity.ThedefectinSCDdoesnotappeartoinfluencecaloricresponses.
