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.