Both myasthenia gravis and Guillain-Barre syndrome are autoimmune disorder, but it is very rare that both of them occur together. A 53-years old woman with history of myasthenia gravis complained of weakness of extremities, worsening progressively for several days. Electrophysiologic study showed findings of motor axonal neuropathy without sensory involvement. She became improved in aspect f of clinical symptoms and electrophysiologic findings after infusion of immunoglobulin. This is a case of Guillain-Barre syndrome in a patient with myasthenia gravis.
