Specifically on the brain, there is something called "functional brain imaging" that shows how a person's brain is working. A Google Search for "functional brain imaging hepatitis c" will bring up articles like:
Patients with chronic hepatitis C exhibit cerebral metabolite alterations and structural or functional neuroimaging abnormalities, which sustain the hypothesis of hepatitis C virus involvement in brain disturbances.
In English, Hep C messes with patients brains, and not in a good way.
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