IDH2 and anaplastic astrocytoma: A similar, although non-significant, proportional difference in elasticity was observed between IDH-mutant and IDH-wildtype anaplastic astrocytoma cases in both white matter (ratio = 2.27, 95% CI 0.69–7.50, p = 0.173) and tumor tissue (ratio = 2.30, 95% CI 0.70–7.60, p = 0.164).