Background: A 20-year-old woman presented to a specialist epilepsy center with a 3-year history of drug-resistant epileptic seizures, progressive myoclonus, ataxia, and cognitive decline.
Investigations: Neurological examination, neuropsychological testing, electrophysiological studies, skin biopsy, MRI, genetic testing, and autopsy.
Diagnosis: Lafora disease (EPM2), resulting from a homozygous missense mutation in EPM2B (NHLRC1; c205C>G; Pro69Ala).
Management: Symptomatic treatment with conventional antiepileptic and antimyoclonic drugs.