opsoclonus-myoclonus syndrome true Opsoclonus-myoclonus syndrome is an autoimmune neurological disorder that may be seen in association with neuroblastoma, following viral infections or may be of unknown cause. The earliest feature is often ataxia followed by opsoclonus (multidirectional, erratic, darting eye movements). Myoclonus is a mixture of small- and larger-amplitude muscle jerks, giving rise to a tremulous appearance. Myoclonus is primarily action-induced, but in severe cases is present at rest. The eye movement abnormality and myoclonus may initially be thought to be epileptic, however the pattern of eye movements allows them to be distinguished from eye movements seen in typical absence seizures. UMLS:C0393626 MONDO:0015247 paraneoplastic opsoclonus-myoclonus OMS dancing eye syndrome Orphanet:1183 dancing eye-dancing feet syndrome oma syndrome paraneoplastic opsoclonus-myoclonus-ataxia syndrome NCIT:C4686 POMA syndrome Opsoclonus myoclonus syndrome (OMS) is a rare neuroinflammatory disease of paraneoplastic, parainfectious or idiopathic origin, characterized by opsoclonus, myoclonus, ataxia, and behavioral and sleep disorders. ICD10:G25.3 GARD:0010009 opsoclonus myoclonus syndrome EFO:1001383 SCTID:230350000 Kinsbourne syndrome ICD9:379.59 opsoclonus-myoclonus-ataxia syndrome MedDRA:10053854 MESH:D053578 Ataxo-opso-myoclonus syndrome rare paroxysmal movement disorder