Abstract
Hashimoto's encephalopathy is a rare neurological syndrome occurring in patients with autoimmune thyroid disease. The diagnosis of Hashimoto's encephalopathy is based on the clinical picture with the presence of serum anti-thyroid antibodies regardless of the thyroid disorder. Acquired cerebellar ataxia associated with Hashimoto's disease is a rare occurrence. In this article, we present a case who had progressive non-familial autoimmune pancerebellar disease in association with an increased level of thyroid peroxidase and thyroglobulin antibodies. The patient was managed aggressively with both intravenous immunoglobulins and plasma exchange, which stopped the progression of the disease and allowed for slow improvement. Early diagnosis of Hashimoto's encephalopathy with autoimmune cerebellar ataxia and intervention with immunomodulatory therapy are of paramount importance. Close monitoring after steroid therapy is important since some patients with this rare disease might be resistant to steroid therapy and require aggressive immunomodulatory therapy.