. _:vb50952768 . "disease_ontology"^^ . . "UMLS_CUI:C1332951"^^ . . _:vb50952768 . "A brain stem cancer characterized by mass lesion of the brainstem in childhood, associated cranial nerve nuclei and long tracts, has_material_basis_in abnormally proliferating cells."^^ . "DOID:4206"^^ . "childhood brain stem neoplasm"^^ . "NCI:C5969"^^ . _:vb50952768 . "pediatric tumor of Brainstem"@en . . . _:vb50952768 . _:vb50952768 .