<prompt> Opsomyoclonus is encountered as CF ofMeningiomaCerebral atrophyExcisionNeurofibramatosis  <response>: At least 50 of children with opsoclonus-myoclonus have an underlying neuroblastoma. - Harrison Opsoclonus-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 Idiopathic Cancer-related paraneoplastic Cancers associated with opsoclonus-myoclonus are usually lung and breast cancers in adults and neuroblastoma in children. Ref : Harrison 17e p626 