Abstract
Paroxysmal dyskinesias are mainly classified into kinesigenic, non-kinesigenic, and exertion-induced dyskinesias according to their phenomena. The diagnosis of paroxysmal kinesigenic dyskinesia (PKD) is made if attacks of abnormal involuntary movements occur abruptly after a sudden voluntary movement. Paroxysmal non-kinesigenic dyskinesia (PNKD) is defined as attacks of involuntary movements occurring spontaneously.Although they have paroxysmal dyskinesia in common, these conditions are thought to have different pathophysiology from the clinical and experimental data. However, the aetiologic mechanisms are still unknown. We report a patient with PNKD in whom T2-weighted magnetic resonance imaging (MRI) showed bilateral very low intensity signals in the globus pallidus and substantia nigra.
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