J.D. BartlestonCynthia J. ChelfDietlind L. Wahner-RoedlerRochester, Minnesota, United States Functional neurological disorders are difficult to diagnose and treat, in large part because there are no objective physical, laboratory, or pathological findings to confirm or exclude the diagnosis. This brief communication describes the Rosenbach eyelid sign (RES) and its association with hyperthyroidism and possibly with functional…