Hashimoto's Encephalitis: Unusual Cause of Reversible Dementia

Hashimoto's encephalopathy (HE) is a poorly understood and often misdiagnosed rare autoimmune disease with varied neurological and psychiatric features. The low prevalence and varied clinical features coupled with unclear pathogenesis and histopathologic characteristics have caused still doubts in any particular diagnostic criteria. Therefore, more case studies are needed to characterize the clinical, laboratory and imaging features and outcomes of HE patients. We describe a case of such a patient with HE presenting with dementia and focus on its early recognition as the cognitive changes are reversible.