 - Arm A High-grade meningioma: Pathological diagnosis of high-grade meningioma, as defined by WHO grade 2 or 3 also known as atypical and anaplasticmalignant meningioma. WHO grade 1 meningiomas with an elevated Ki67 proliferation rate of or 8 are also considered high-grade for the purposes of this trial, due to their poor prognosis32, 86-88. The meningioma may be treated in the scenario of either adjuvant treatment radiation therapy following complete sub-total biopsy only resection or recurrent disease re-growth following surgery alone. Measurable disease is not required. 