Paraneoplastic opsoclonus associated with squamous cell carcinoma of the tongue

Opsoclonus is a pathological eye movement phenomenon in which the eyes experience involuntary, arrhythmic, rapid, multidirectional, conjugate movements. It occurs in all eye positions and during smooth pursuit, and can also persist during sleep. It is differentiated from nystagmus in that there is no slow eye movement phase, and it differs from ocular flutter because the eye movement is multidirectional and not confined to the horizontal. Opsoclonus can be accompanied by tremors, cerebellar ataxia, myoclonic jerks, or encephalopathy.
Source: Clinical Neurology and Neurosurgery - Category: Neurosurgery Authors: Tags: Case Report Source Type: research