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A patient with high-grade multi-focal glioma deteriorated rapidly despite high dose corticosteroid therapy (dexamethasone: 16 mg/day). MRI was used to measure diffusion tensor parameters and longitudinal relaxation time (T-1) values of peritumoural oedematous brain before and after commencing steroid treatment. Forty-eight hours after steroid treatment there was no evidence of brain oedema reduction. Specifically, regions of oedematous brain showed a significant increase in mean diffusivity (