Hashimoto's encephalopathy (HE) is a steroid-responsive encephalopathy associated with high titers of antithyroid antibodies. To date, 57 pediatric-, adult-, and elderly-onset cases have been described in the literature. The clinical picture is pleomorphic, and cognitive impairment is a frequently reported symptom. We report the case of a patient with slowly progressive cognitive impairment possibly caused by HE. The issue of the differential diagnosis with primary dementia is discussed. A review of cases of HE showing cognitive deterioration is also presented, and factors possibly related to characteristics of cognitive impairment and outcome after therapy are considered.
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Galluzzi et al. (2002) studied this question.
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