While Hashimoto's encephalopathy (HE) is quite rare, it is also likely that there are many more undiagnosed sufferers. Because it is little known and its symptoms are primarily neurological, it is easy to misdiagnose or overlook and the symptoms frequently lead to mistaken neurological diagnoses. We report a case of a 21-year-old female diagnosed with HE at 6 months of gestation. She was successfully treated. HE is a neuropsychiatric disorder of exclusion. As a good response can be obtained with corticosteroid therapy, early diagnosis and treatment is very beneficial for patients. To the best of our knowledge, there is no such report in the literature.
Keywords: Hallucinations; Hashimoto's encephalopathy; steroid; thyroiditis.