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PapillarycraniopharyngiomaPituicytoma,granularcelltumorofthesellarregion,andspindlecelloncocytomaRecentfindingsregardingbiology,moleculartumor typing,andclinicaloutcomehavesignificantlyimpactedtheclassificationofependymomas,whichisnowreflectedbytheupdatedWHOCNStumorclassification systemMetastasestotheCNSTheWHOnowclassi-fiesgliomas,glioneuronaltumorsandneuronaltumorsintofamilies,threeofwhichencompass pLGG/LGNTs:“Pediatrictypediffuselowgradegliomas,”“circumscribedastrocyticgliomas,”and“glioneuronalandneuronaltumors”Thisreviewrepresentsthe firstofatwo-installmentreviewseriesonthemostrecentchangestotheWHObraintumorclassificationsystemPituitaryadenoma/PitNETMixedgermcell tumorRSNA,ThisfirstinstallmentfocusesonthechangestotheclassificationofadultandpediatricgliomasofgreatestrelevanceforradiologistsInrecentyears, therehasbeensignificantprogressinunderstandingthemolecularpathogenesisofbraintumorsThisreviewfocusesonchangescomparedtotheprevious classificationofanddiscusseshowaformalgrading, Traditionally,classificationhasbeenbasedontumorhistology,butthisisofteninaccurate. Adamantinomatouscraniopharyngioma.Pituitaryblastoma.In,theWHOCNStumorupdateforthefirsttimecombinedmoleculardatawithhistologyinclassifying CNStumorsChoriocarcinomaTumorsofthesellarregion