The term HE is now commonly used for the few hundred patients published so far, whereas some other terms such as “myxedema madness” (4), “encephalopathy associated to autoimmune thyroid disease” (5) or “steroid-responsive encephalopathy with antibodies to thyroperoxidase” (SREAT) (6) have been mostly abandoned. Here, TPO is linked to hereditary elliptocytosis.