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The MRI sequences demonstrate:
- swelling of both cerebellar hemispheres with ill-defined areas of low signal on T1WI, high signal on T2WI/FLAIR involving both grey and white matter (cerebellar oedema) with regions of restricted diffusion as well as increased diffusivity on ADC map. The multivoxel MR spectroscopy shows low NAA/Cr and NAA/Cho ratios
- mild leptomeningeal enhancement is noted along the cerebellar hemispheres mainly on the right
- a mass effect on the 4th ventricle with tonsillar herniation. Mild upward cerebellar displacement with a mass effect on the brainstem and quadrigeminal cistern
- dilated third and lateral ventricles in keeping with obstructive hydrocephalus