Abstract:Propriospinal myoclonus is a rare movement disorder characterised by axial flexion or extension myoclonic jerks, produced by activation of spinal segments spreading rostrally or caudally. We present a 54-year-old man with propriospinal myoclonus confirmed on multimodal surface electromyography. Magnetic resonance imaging of his spinal cord was normal. He has a family history of fragile X syndrome and previous screening of his FMR1 gene revealed one allele with 78 CGG triplet repeat expansion, within the premut… Show more
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