_:vb50937838 . _:vb50937838 "url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3306779/"^^ . _:vb50937838 . _:vb50937838 "url:http://en.wikipedia.org/wiki/Medulloblastoma"^^ . _:vb50937838 "An infratentorial cancer that is located_in the lower part of the brain and is a type of primitive neuroectodermal tumor."^^ . _:vb50937838 . _:vb50937838 . _:vb50937838 "url:http://www.cancer.gov/dictionary?CdrID=45780"^^ . _:vb50937838 . _:vb50937838 . _:vb50937838 .