Lingering Effects: Hashimoto's Encephalopathy.

Hashimoto's encephalopathy (HE), also known as steroid-responsive encephalopathy associated with autoimmune thyroiditis (SREAT), is a rare autoimmune disease that remains poorly understood. Here, we report a patient who experienced numerous comatose relapses early in the disease course. Despite prolonged corticotherapy, cognitive deficits have persisted through the two-year post-diagnosis follow-up. This case highlights the protracted nature of HE.