DO_cancer_slim NCIthesaurus posterior fossa ependymoma posterior fossa group A ependymoma NCI:C186450 DOID:0081254 ICDO:9396/3 A posterior fossa ependymoma that arises in the posterior fossa with characteristic DNA methylation patterns, including CpG island hypermethylation, global DNA hypomethylation, reduction of nuclear H3 p.K28me3 (K27me3) expression, and EZHIP overexpression. Posterior Fossa Ependymoma, Group A (PFA) Posterior fossa group A (PFA) ependymoma disease_ontology