Accurate cerebellar infarction diagnosis frequently relies on careful attention to patients' coordination, gait, and eye movements–components of the neurological physical examination that are sometimes omitted or abridged if cerebellar stroke is not specifically being considered.
CT scan: may be normal very early in these patients. There may be subtle findings of a tight posterior fossa: compression or obliteration of basal cisterns or 4th ventricle or hydrocephalus.
MRI: (including DWI) more sensitive for ischemia, especially in the posterior fossa 1) 2).