Definition

Opsoclonus myoclonus is a syndrome in which the eyes dart involuntarily (opsoclonus or dancing eyes) and muscles throughout the body jerk or twitch involuntarily (myoclonus).

Description

Opsoclonus myoclonus is a very rare syndrome that strikes previously normal infants, children, or adults, often occurring in conjunction with certain cancerous tumors, viral infections, or medication use. Onset can be very sudden and dramatic, with a quick progression.

Demographics

Most children who develop opsoclonus myoclonus are under the age of two when they are diagnosed. Boys and girls are affected equally.

Causes and symptoms

Many cases of opsoclonus myoclonus follow a bout of a viral illness such as infection with influenza, Epstein-Barr or Coxsackie B viruses, or after St. Louis encephalitis. About...