Miller Fisher's syndrome.

Miller Fisher's syndrome is a rare variant of Guillain-Barré's syndrome characterized by the acute development of ataxia, ophthalmoparesis, and areflexia. Most patients have a measureable antibody in serum directed against the GQ1b ganglioside. This antibody is also present in the serum of patients with other forms of Guillain-Barré's syndrome who have prominent ataxia or ophthalmoplegia as part of their clinical presentation. Miller Fisher's syndrome generally is self-limited and has an excellent prognosis.