ignalintensityonT2-weightedimages,dependingontheamountofmineralizationpresentinthecenterofthenidus.第5页/共33页Edemainadjacentbonemarrowandsofttissueandjointeffusionalsomaybeseen(Fig3)。paredwithCT,MRimagingisoflimitedvalueindepictingthenidus。MRimagingsometimesfailstodepictsmallnidi,becausethesignalinthenidusoftenissimilartothatincorticalbone(Fig4).第6页/共33页第7页/共33页第8页/共33页IntraarticularOsteoidOsteomaIntraarticularosteoidosteoma,urswithinornearajoint,isconsideredaseparateclinicalentity。monlyinvolvedjointisthehip.Theankle,elbow,wrist,monlyaffected。第9页/共33页Imagingfindingsofintraarticularosteoidosteomadifferfromthoseofintracorticalosteoidosteoma.Withintraarticularosteoidosteoma,reactivecorticalthickeningisminimalorabsent,afindingbelievedtobeduetoalackofcambium,theinnerlayeroftheperiosteum.第10页/共33页
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