STATdx精选耳硬化症文

Otosclerosis

TroyA.Hutchins,MD

KEYFACTS

NEXTTerminology

Startsperifenestral(FOto),progressestosurroundcochlea(FOto+COto)

Synonym:Otospongiosis

Types:Fenestralotosclerosis(FOto),cochlearotosclerosis(COto)

Pathologicappearanceoflyticspongybonefociinbonylabyrinthofunknowncause

Fissulaantefenestram:Cleftoffibrocartilaginoustissuebetweeninnermiddleearsjustanteriortoovalwindow

Imaging

Bestdiagnosticclue:TemporalboneCTshowslytic(otospongiotic)fociinvolvingbonylabyrinth

FOto:Startsatanteriormarginofovalwindow(fissulaantefenestram)

COto:Affectspericochlearbonylabyrinth

TopDifferentialDiagnoses

Chronicotitismediawithtympanosclerosis

TemporalbonePagetdisease

Temporalbonefibrousdysplasia

Temporalboneosteoradionecrosis

Temporalboneosteogenesisimperfecta

Pathology

Enchondrallayerofbonylabyrinthdisplaysspongy,vascular,decalcified,irregularboneformation

ClinicalIssues

Bilateralprogressiveconductive(FOto)ormixed(FOto+COto)hearinglossinyoungadult

DiagnosticChecklist

Typicalotospongioticplaquesof"otosclerosis"arelyticaffectbonylabyrinth

TERMINOLOGY

PREVIOUSNEXTAbbreviations

Fenestralotosclerosis(FOto)

Cochlearotosclerosis(COto)

Synonyms

Otospongiosis,fenestralotospongiosis,cochlearotospongiosis

Definitions

Alsocalled"cochlearcleft"

Startsperifenestral(FOto),progressestosurroundcochlea(FOto+COto)

Pathologicappearanceoflyticspongybonefociinbonylabyrinthofunknowncause

Fissulaantefenestram:Cleftoffibrocartilaginoustissuebetweeninnermiddleearsjustanteriortoovalwindow

IMAGING

PREVIOUSNEXTGeneralFeatures

FOto:Ovoidplaquesmost

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