Question: What is (are) Opsoclonus Myoclonus ?
Answer: Opsoclonus myoclonus is a rare neurological disorder characterized by an unsteady, trembling gait, myoclonus (brief, shock-like muscle spasms), and opsoclonus (irregular, rapid eye movements). Other symptoms may include difficulty speaking, poorly articulated speech, or an inability to speak. A decrease in muscle tone, lethargy, irritability, and malaise (a vague feeling of bodily discomfort) may also be present. Opsoclonus myoclonus may occur in association with tumors or viral infections. It is often seen in children with tumors.
Source: NINDS