Cramp-fasciculation syndrome (cramp-FS) is an ill-defined condition with uncertain clinical limits. The authors studied a 55-year-old man with progressively more severe, widespread fasciculations and cramps during a 6-year-period. Mild progressive lower motor neuron loss, shown by motor unit number and multi-motor unit potential (MUP) analysis, developed during the 4 years after onset, which stabilised during a further 2-year follow-up. Cramp-FS is generally a benign syndrome, probably with several causations. Our patient developed a limited form of anterior horn cell degeneration perhaps representing a syndrome transitional with amyotrophic lateral sclerosis. Cramp-FS merits more detailed study.
- amyotrophic lateral sclerosis
- cramp-fasciculation syndrome
- motor neuron disease
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