Magnetic Resonance Imaging Reveals a Pronounced Treatment Response of a Isocitrate Dehydrogenase- and B-Raf Proto-Oncogene-Wildtype Epithelioid Glioblastoma

We here report findings on magnetic resonance imaging from a 60-year-old patient with an epithelioid glioblastoma of the corpus callosum treated with radiotherapy in combination with concomitant and adjuvant temozolomide. Neuropathology revealed a highly aggressive molecular subtype of the epithelioid glioblastoma without an isocitrate dehydrogenase and B-Raf proto-oncogene mutation or a 06-methylguanine-DNA-methyltransferase promoter hypermethylation. This subtype is typically associated with an unfavorable clinical course and poor overall survival. Unexpectedly, the first follow-up magnetic resonance imaging 10 weeks after chemoradiation completion revealed an early and almost complete treatment response