<prompt> Opsomyoclonus is encountered as CF of -MeningiomaNeuroblastomaNeurofibromatosisExcision  <response>: At least 50 of children with opsoclonus-myoclonus have an underlying neuroblastoma. - HarrisonOpsoclonus-Myoclonus Syndrome Opsoclonus is a disorder of eye movement characterized by involuntary, chaotic saccades that occur in all directions of gaze; it is frequently associated with myoclonus and ataxia.Causes of Opsoclonus-myoclonus IdiopathicCancer-related paraneoplasticCancers associated with opsoclonus-myoclonus are usually lung and breast cancers in adults and neuroblastoma in children. 