•First report of a secondary somatic glioblastoma arising from MCT-MT in a patient with underlying Li-Fraumeni syndrome.•The rarity of glioblastoma arising from MCT-MT warrants investigation for underlying genetic predisposition.•Glioblastomas arising from MCT-MT appear to exhibit wild type IDH gene status.•Advanced-stage glioblastoma arising from MCT-MT exhibits aggressive behavior and requires adjuvant therapy.•Optimal adjuvant therapy regimen for glioblastoma arising from MCT-MT remains unknown.
Keywords: Advanced-stage treatment; IDH; Li-Fraumeni Syndrome; Mature ovarian cystic teratoma; Secondary somatic glioblastoma; TP53.
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