Moderate dilatation of both lateral ventricles with extensive low attenuation of the surrounding white matter consistent with transependymal oedema. Marked heterogeneity of the cerebellar hemispheres more prominent on the right side and distortion of the fourth ventricle. Early tonsillar herniation no more than 5mm in depth.
No intracranial haemorrhage of infarction.
Conclusion: Poorly defined right cerebellar lesion likely metastatic disease causing severe mass effect and obstructive hydrocephalus.