Combination of Cerebral Demyelination and Graves Disease in a Case with Miller Fisher Syndrome

A 44-year-old male patient with a diagnosis of Miller Fisher syndrome, Graves disease and central nervous system demyelination is presented. Clinical and laboratory findings supported the diagnosis of Miller Fisher syndrome. On T2-weighted sections of cranial magnetic resonance imaging, many ovoid-shaped, hyperintense lesions in bilateral deep white matter were detected. Magnetic resonance imaging spectroscopy demonstrated low N-acetylaspartate to creatine (NAA/Cr) ratio consistent with demyelination. Combined peripheral nervous system and central nervous system demyelinating processes are rare. In this Miller Fisher syndrome case, an immunological mechanism affecting both the peripheral nervous system and central nervous system with association of Graves disease is discussed in light of the relevant literature. A positive response to intravenous immunoglobulin G treatment was obtained.