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Early-onset Lafora body disease

Disease definition

Early-onset Lafora body disease is an extremely rare, inherited form of progressive myoclonic epilepsy characterized by progressive myoclonus epilepsy and Lafora bodies, with an early onset (at around 5 years) and a prolonged disease course. Other manifestations include progressive dysarthria, ataxia, cognitive decline, psychosis, dementia, spasticity, dysarthria, myoclonus, and ataxia. The disease course typically extends for several decades.


  • Synonym(s): -
  • Prevalence: <1 / 1 000 000
  • Inheritance: Autosomal recessive 
  • Age of onset: Childhood
  • ICD-10: G40.3
  • OMIM: 616640
  • UMLS: -
  • MeSH: -
  • GARD: -
  • MedDRA: -
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