PMC9122005_01
Clinical examination on admission in the hospital. The video shows left hemichoreic and ballistic involuntary movements.. Clinical examination the day after treatment with corticosteroids. The video shows a dramatic improvement of the abnormal movements shown in Video 1.
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Brain MRI were performed upon admission and repeated two weeks later; no lesion or abnormal signal in the basal ganglia were visible (Figure 1).
Brain magnetic resonance imaging (MRI) of the patient. A: T1-weighted axial image, and B: fluid attenuated inversion recovery (FLAIR) axial image, showing normal findings in the basal ganglia and Fazekas 1 leucopathy.
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Moreover, the presence of oligoclonal bands in the cerebrospinal fluid (CSF) and the increased metabolism of the right putamen (compared to the left side) on the FDG-PET were both consistent with this diagnosis (Figure 2A). Finally, we repeated a brain FDG-PET three weeks later, which showed that the asymmetrical metabolism of the putamen had resolved (Figure 2B).