Myelitis preceding anti-N-terminal of α-enolase antibody-positive Hashimoto's encephalopathy.

Hashimoto's encephalopathy is an autoimmune disease characterized by diverse clinical and imaging manifestations, often presenting considerable challenges in its diagnosis, especially when myelitis occurs before the onset of encephalopathy. Anti-N-terminal of α-enolase antibodies targeting the N-terminal of α-enolase are specific serum markers of Hashimoto's encephalopathy; however, studies analyzing their association with myelitis are lacking. Herein, we describe the case of a patient with myelitis who later developed encephalopathy. Owing to positivity for anti-N-terminal of α-enolase antibodies in the serum, a diagnosis of Hashimoto's encephalopathy was made. Detecting anti-NAE antibodies can be useful in diagnosing myelitis of unknown etiology.