Radiographicfeatures

BothCTandMRIdemonstratesimilarfeatures,althoughMRIhastheabilitytobetterdistinguishcerebralabscessfromotherringenhancinglesions.

1.earlycerebritis

maybeinvisibleonCT

poorlymarginatedcorticalorsubcorticalhypodensitywithmasseffectwithlittleorabsenceofenhancement

2.latecerebritis

irregularrimenhancinglesionwithhypodensecenter,betterdefinedthanearlycerebritis

3.earlycapsule

well-definedrimenhancingmass;anouterhypodenseandinnerhyperdenserim(doublerimsign)isseeninmostcases

.latecapsule

rimenhancinglesionwiththickenedcapsuleanddiminishedhypodensecentralcavity

Inpatientswithsuspectedintraparenchymalsepsis,pre-andpostcontrastscansshouldbeobtained,unlesstheplanistoproceedtoMRIregardlessoftheCTfindings.Typicalappearancesinclude:

ringofiso-orhyperdensetissue,typicallyofuniformthickness

centrallowattenuation(fluid/pus)

surroundinglowdensity(vasogenicoedema)

ventriculitismaybepresent,seenasenhancementoftheependyma

obstructivehydrocephaluswill







































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