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Objectives:ToinvestigatethekeyimagingpointsindistinguishingossifyingIPfrompolyp. Materials and methods:ThenativeCT,conventionalandenhancedMRImanifestationsof20ossifyingIPsand8polypsprovenbypathologywereretrospectivelyevaluatedby2doctorsmajoringinheadandneckimaging.