Central pontine myelinolysis
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High T2 and DWI signal in the pons, sparing the periphery in a patient with atrophy, which appears more marked in the cerebellum. Note how the signal abnormality crosses the mid-line making ischaemia unlikely, as the pontine perforators are end-arteries which do not cross the mid-line.
Unfortunately I do not have evidence supporting the diagnosis central pontine myelinolysis. Nonetheless in a patient with cerebellar atrophy this is the likely diagnosis.