Can encephalitis be seen on ct?

CT can be helpful. Head ct can show other causes of similar symptoms, such as evidence of elevated intracranial pressure , obstructive hydrocephalus, or mass effect due to focal brain infection or bleeding. Ct can also suggest some causes of encephalitis.
Yes it shows changes. Cat scan will show changes like hypodensity, a gyral or patchy pattern of enhancement may be seen and may be other changes.