_:vb50954001 . _:vb50954001 . _:vb50954001 "url:http://www.cancer.gov/dictionary?CdrID=46432"^^ . _:vb50954001 . _:vb50954001 . _:vb50954001 "A high grade ependymoma that has_material_basis_in cells linking the spinal cord central canal."^^ . _:vb50954001 . _:vb50954001 .