Table 3 Diagnostic criteria for Hashimoto encephalopathy¹¹

 1. Encephalopathy with seizures, myoclonus, hallucinations, or stroke-like episodes

 2. Thyroid disease (subclinical or mild overt)

 3. MRI scan of brain – normal or with nonspecific abnormalities

 4. Serum thyroid antibodies present

 5. Absence of other neuronal antibodies in serum or CSF

 6. Exclusion of alternative causes of encephalopathy by differential diagnosis